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Counting Particles. Matter. Atomic Theory. P.T. Trends. Grab Bag. 100. 100. 100. 100. 100. 200. 200. 200. 200. 200. 300. 300. 300. 300. 300. 400. 400. 400. 400. 400. 500. 500. 500. 500. 500. 600. 600. 600. 600. 600. What is Chemistry?. The Study of Matter. - PowerPoint PPT Presentation

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What is Chemistry?

The Study of Matter

What is the name for a substance that cannot be

broken down by either chemical or physical means?

An Element

What is the name for a substance that contains 2 or more elements and cannot be broken down by physical

means?

Compound

What is a combination of 2 or more substances that can be

separated by physical means?

A mixture

What type of mixture is not uniformly blended?

Heterogenous Mixture

What is a cation?

A positively charged ion

What type of mixture is uniformly blended?

Homogenous mixture

Most of the mass of an atom is found where?

The Nucleus

Most of an atom is made up of what?

Empty Space

What is the mass of a proton in AMU’s?

1 amu

What is the mass of an electron?

Essentially Zero

What two particles’ masses are used in determining the atomic mass number?

Protons + Neutrons

Which scientist’s gold foil experiment helped to show that most of an atom is

empty space?

Rutherford

What does the atomic number of an element mean?

The number of protons

How do you determine the number of electrons in a neutral atom?

# of electrons = atomic number

What is an isotope?

An element with a different number of neutrons

How many protons and neutrons does 37Cl have?

17 protons and 20 neutrons

How many electrons does 20Ca2+

have?

18 electrons

What kind of energy does an excited electron typically

emit?

Light

What is electron affinity?

An atom’s desire to grab an extra

electron

What is the periodic trend for electron

affinity?

Increases from left to right

Increases from left to right

What is the periodic trend for ionization energy

What are the two periodic trends for atomic radius?

Decreases from left to rightIncreases from top to bottom

Why does atomic radius increase as you move from the top to the bottom

of the Periodic Table?

Extra shells are added

Which type of elements are found to the left of the stairs?

Metals

Name 3 characteristics of metals

Good conductorsShiny lusterMalleableDuctileSolids at room tempTend to lose electrons

What are valence electrons?

Electrons in the outermost shell

How many valence electrons does an atom with an electron

configuration of 2-8-18-5 have?

5 valence electrons

What is sublimation?

A change in phase from a solid directly into a gas

What are the only 2 elements that are liquids at room temperature on the

periodic table?

Bromine and Mercury

Final Jeopardy

Category:

Periodic Trends

Define Ionization Energy.

The amount of energy required to remove the outermost electron

of an atom.