https://answers.yahoo.com/question/index?qid=20100908090846AAMC4kw

What is the charge (in coulombs) of a sodium ion?Is it just a positive elementary charge of 1.602×10-19 coulombs, or am I mistaken? Thanks for your help!

Dr WMember Since: May 09, 2006Points: 223397 • Level: 7Total Answers: 19984Points this week: 70Answers

Best Answer:  1 coulomb = the charge of 6.241x10^18 protons = -charge of 6.241x10^18 electrons

so... 1 proton has charge 1 / 6.241x10^18 = 1.602x10^-19 coulombs

so... an atom with a +1 charge (the same as 1 proton), will have a charge = 1.602x10^-19 coulombs

******** or you could think of it like this... 1 Na(+) x (1 extra proton / 1 Na(+)) x (1.602x10^-19 coulombs / proton) = 1.602x10^-19 coulombs

Dr W · 5 years ago

https://www.physicsforums.com/threads/help-calculating-charge-of-cl-and-k-ions.122781/

https://www.physicsforums.com/threads/help-calculating-charge-of-cl-and-k-ions.122781/Sorry if this is a ridiculously simple problem, but I don't get it. The professor didn't give examples of how to do this and it's been years since I've taken science courses. I have to determine the electric force (Coulomb's Law) on the K+ ion due to the Cl- ion 9E-10m away. How do you determine the charge of the K+ and Cl- ions? K(19) has atomic mass 39.0983 and Cl(17) has atomic mass 35.4527... but I don't know where to start with calculations. Please help? Thank you. K+ indicates a charge of +1e; Cl- indicates a charge of -1e, where e is the charge of an electron in coulombs. Therefore, the charge on the K+ in coulombs is 1 × (1.6x10-19). Do you follow?

Reference https://www.physicsforums.com/threads/help-calculating-charge-of-cl-and-k-ions.122781/

What charge does an atom have?plz help so confusing

an atom have [what] charge?

Best Answer:  Atoms have equal number of protons and electrons thus canceling out the positive and negative charge respectively.

Ions are particles that has already given or lost their electrons to or from another atom so becoming charged particles called ions.

Gaara of the Sand · 9 years ago

get this clear because if ur studying chemistry or physcis, you need to understand this.

atoms have NO charge. Why, u ask? u need to understand the role and protons and electrons in an atom to understand why atoms have NO charge.

PROTONS have a +1 charge. they are contained in the central part (nucleus) of the atom. their location however has nothing to do with this. ELECTRONS have a -1 charge. they are orbiting the nucleus.

in an atom, NUMBER OF PROTONS = NUMBER OF ELECTRONS (always, always, always, always) therefore, the number of +1 charges (of the protons) equals the number of -1 charges (of the electrons) therefore, the two charges are opposite and equal and they cancel each other out.

therefore, atoms have NO charge. however, when an atom loses an electron or gains an electron, it is known as an ION. in this case, the number of charges is not equal and they do not balance and cancel each out.

THEREFORE, AN ATOM HAS NO CHARGE AN ION HAS A CHARGE

hope that clears ur doubts Source(s): AS chemistry studenthttps://answers.yahoo.com/question/index?qid=20070120072716AAuE3Bk

http://courses.washington.edu/biophys/homework/hw5.htm

Homework #5:  Assigned 7/18/01  Due: 7/25/01 at the start of class. Reading (one of the following)Aidley  p 19-21, 26-29, 149-165or KSJ (3rd edition) p 81-89, 135-144, 153-158, 173-186Useful formulae:charge(Coulombs) = capacitance(Farads) * voltage(Volts)1 Coulomb = 1 Amp * 1 secondcharge of an electron = -1.6 e-19 Coulombscharge of a K+ or Na+ ion = 1.6 e-19 Coulombs

Number of particles in a mole = 6.02 e23Energy (Joules) = charge (coulombs) * voltage change (volts)1 Liter = 1000 cubic centimeterPlease use SI units…anyone using cgs units on this homework will be whipped with a soldering iron.1. Recall from lecture #4 that cells have a capacitance due to their outer membrane being a good insulator.  The specific capacitance of cellular membranes is 1 uF/cm^2.(millimolar, or millimoles per liter) and an external concentration of 2 mM K+ and Cl-.  The cell's membrane is permeable to K+ only.  Initially (time = 0) the cell is at 0 mV (same voltage inside & outside of the cell).quickly to become negative (because K+ diffuses out of the cell). A) What is the steady state voltage of the cell?B) What is the net number of K+ ions that moved out of the cell? C) How much has the K+ concentration changed inside of the cell?2. Boltzmann's constant, k = 1.38 e-23 Joules/degree Kelvin.  What is kT in SI units at room temperature (T=300 K)?  What is kT in terms of milli-electron volts (energy required to move an electron through a voltage change of 1 millivolt)?unit conversion, but because this number appears EVERYWHERE you're dealing with electronics--the Nerdst equation, the voltage dependence of ion channels and semiconductor junctions, Johnson noise, etc.carriers in any medium, and if we're in the realm of electronics, we want that energy in terms of volts (times charge).3. A typical photoreceptor has synapses with many cells.  Retinal cells have a capacitance of about 20 pF.  Suppose that rather than having chemical synapses, photoreceptors were directly electrically coupled to other cells--i.e. all cells change their voltage together.problems.  First is that there's no way to make an inverter (an ON bipolar cell).  Another problem comes from the capacitance.  Recall that a single photon produces a voltage change of about 2 mV in 200 ms.change the voltage by 2 mV in 200 ms (assume current is constant in time)?  How does this compare with the magnitude of the single photon current change in the rod?4. In honor of Erika's ethanol research, let's look at the (hypothetical) effects of high ethanol concentration on vision.  Turns out that ethanol acts on neurotransmitter receptors:Imagine you were monitoring the current flowing into an ON and OFF bipolar cell.  Now imagine that we dump ethanol onto the cells.  Suppose this causes the current flowing through ionotropic receptors in bipolar cells to be reduced.flowing into the two types of bipolar cells in total darkness?  In bright (saturating) light?   Would the single-photon response be affected?  How?5. Suppose I build a cell that has a membrane permeable only to sodium ions (Na+).  The Na+ channels (that let Na pass through the membrane) are always open.

What is the relative ratio of sodium ions outside vs. inside of the cell?  Also, give a hand-wavy explanation for why the slopes of the current-voltage relation above are different for extremely positive and negative potentials.should look like if the internal & external sodium were equal?

An ion of Potassium (K+) has a charge of positive one (+1). How does a neutral atom of potassium become?a positively charged ion of potassium?

8%BEST ANSWERS

ChachMember Since: October 03, 2009Points: 2 • Level: 1Total Answers: 35Points this week: 0Answers

Best Answer:  A neutral atom of potassium has 2,8,8 ,1 electron configuration.

That is 19 electrons. 1 valence shell and 1 valence electron.

To become a positive ion it looses its valence electron with its valence shell and becomes K+ by achieving the configuration of 2,8,8 with 3 energy levels/shells.

It can loose its electrons to any non metal atom that needs an electron to be stable .

Take Cl for example. It has 7 electrons in its valence shell . Potassium can loose its electron to chlorine to form a a positive potassium ion and Chlorine gains 1 to form a negative Chlorine ion.

Together they form K+Cl- or KCl.

Positive ions are said as cations and negative ions as an ion.

Hope it helps!

chris j · 5 years agohttps://answers.yahoo.com/question/index?qid=20110127165516AAbbTM6

Atoms contain negatively charged electrons and positively charged protons; the number of each determines the atom's net charge.LEARNING OBJECTIVES[ non-admins go to feedback page edit ]

Provide value of an elementary chargeIdentify factors that determine the atom's net charge

KEY POINTS[ non-admins go to feedback page edit ]A proton is a positively charged particle

located in the nucleus of an atom. An electron has 11836times the mass of a proton, but an equal and opposite negative charge.

An elementary charge -- that of a proton or electron -- is approximately equal to 1.6×10-19Coulombs.

Unlike protons, electrons can move from atom to atom. If an atom has an equal number of protons and electrons, its net charge is 0. If it gains an extra electron, it becomes negatively charged and is known as an anion. If it loses an electron, it becomes positively charged and is known as a cation.

TERM[ non-admins go to feedback page edit ]

nucleus the massive, positively charged central part of an atom, made up of protons and neutrons

Source: Boundless. “Electric Charge in the Atom.” Boundless Physics. Boundless, 21 Jul. 2015. Retrieved 03 Oct. 2015 from https://www.boundless.com/physics/textbooks/boundless-physics-textbook/electric-charge-and-field-17/overview-133/electric-charge-in-the-atom-474-10930/

Protons and neutrons are called nucleons. Over 99.94% of the atom's mass is in the nucleus. The protons have a positive electric charge, the

electrons have a negative electric charge, and the neutrons have no electric charge. If the number of protons and electrons are equal, that atom is electrically neutral.https://en.wikipedia.org/wiki/Atom

Lights, Camera, Action Potential

This page describes how neurons work. I hope this explanation does not get too complicated, but it is important to understand how neurons do what they do. There are many details, but go slow and look at the figures.

Much of what we know about how neurons work comes from experiments on the giant axon of the squid. This giant axon extends from the head to the tail of the squid and is used to move the squid's tail. How giant is this axon? It can be up to 1 mm in diameter - easy to see with the naked eye.Neurons send messages electrochemically. This means that chemicals cause an electrical signal. Chemicals in the body are "electrically-charged" -- when they have an electrical charge, they are called ions. The important ions in the nervous system are sodium and potassium (both have 1 positive charge, +), calcium (has 2 positive charges, ++) and chloride (has a negative charge, -). There are also some negatively charged protein molecules. It is also important to remember that nerve cells are surrounded by a membrane that allows some ions to pass through and blocks the passage of other ions. This type of membrane is called semi-permeable.Resting Membrane Potential

When a neuron is not sending a signal, it is "at rest." When a neuron is at rest, the inside of the neuron is negative relative to the outside. Although the concentrations of the different ions attempt to balance out on both sides of the membrane, they cannot because the cell membrane allows only some ions to pass through channels (ion channels). At rest, potassium ions (K+) can cross through the membrane easily. Also at rest, chloride ions (Cl-)and sodium ions (Na+) have a more difficult time crossing. The negatively charged protein molecules (A-) inside the neuron cannot cross the membrane.

In addition to these selective ion channels, there is a pump that uses energy to move three sodium ions out of the neuron for every two potassium ions it puts in. Finally, when all these forces balance out, and the difference in the voltage between the inside and outside of the neuron is measured, you have the resting potential. The resting membrane potential of a neuron is about -70 mV (mV=millivolt) - this means that the inside of the neuron is 70 mV less than the outside. At rest, there are relatively more sodium ions outside the neuron and more potassium ions inside that neuron.

Action Potential

The resting potential tells about what happens when a neuron is at rest. An action potential occurs when a neuron sends information down an axon, away from the cell body. Neuroscientists use other words, such as a "spike" or an "impulse" for the action potential. The

action potential is an explosion of electrical activity that is created by a depolarizing current. This means that some event (a stimulus) causes the resting potential to move toward 0 mV. When the depolarization reaches about -55 mV a neuron will fire an action potential. This is the threshold. If the neuron does not reach this critical threshold level, then no action potential will fire. Also, when the threshold level is reached, an action potential of a fixed sized will always fire...for any given neuron, the size of the action potential is always the same. There are no big or small action potentials in one nerve cell - all action potentials are the same size. Therefore, the neuron either does not reach the threshold or a full action potential is fired - this is the "ALL OR NONE" principle.

Action potentials are caused when different ions cross the neuron membrane. A stimulus first causes sodium channels to open. Because there are many more sodium ions on the outside, and the inside of the neuron is negative relative to the outside, sodium ions rush into the neuron. Remember, sodium has a positive charge, so the neuron becomes more positive and becomes depolarized. It takes longer for potassium channels to open. When they do open, potassium rushes out of the cell, reversing the depolarization. Also at about this time, sodium channels start to close. This causes the action potential to go back toward -70 mV (a repolarization). The action potential actually goes past -70 mV (a hyperpolarization) because the potassium channels stay open a bit too long. Gradually, the ion concentrations go back to resting levels and the cell returns to -70 mV.And there you have it...the Action Potential

The neutral sodium atom has 11 protons and 11 electrons, which means it has 11 positive charges and 11 negative charges. Overall, the sodium atom is neutral www.dummies.com/how-to/.../ions-atoms-with-an-electrical-charge.html