Group 1 – The Alkali Metals Watch the demo. Write down your observations. Write down the chemical...

Group 1 – The Alkali Metals

• Watch the demo.• Write down your observations.• Write down the chemical reactions (word and

symbol)

Group 7 – The Halogens

Group 1 and 7 elements react with each other.

• Can you explain why?

In an IONIC bond,electrons are lost or gained,resulting in the formation of IONS

in ionic compounds.

The compound potassium fluorideconsists of potassium (K+) ions

and fluoride (F-) ions

The ionic bond is the attractionbetween the positive K+ ion

and the negative F- ion

Covalent bonding

Sowhatarecovalentbonds?

In covalent bonding,atoms still want to achievea noble gas configuration.

But rather than losing or gainingelectrons,atoms now share an electron pair.

In covalent bonding,atoms still want to achievea noble gas configuration.

But rather than losing or gainingelectrons,atoms now share an electron pair.

The shared electron pairis called a bonding pair

Chlorineforms

acovalent

bondwithitself

ClClHowwilltwochlorineatomsreact?

ClClEach chlorine atom wants to gain one electron to achieve an octet

ClClNeither atom will give up an electron –chlorine is highly electronegative.

What’s the solution – what can theydo to achieve an octet?

Cl Cloctet

circle the electrons foreach atom that completestheir octets

The octet is achieved byeach atom sharing theelectron pair in the middle

This is the bonding pair

It is a single bonding pair

It is called a SINGLE BOND

Single bonds are abbreviatedwith a dash

This is the chlorine molecule,

O2Oxygen is also one of the diatomic molecules

How will two oxygen atoms bond?

OOEach atom has two unpaired electrons

Oxygen atoms are highly electronegative.

So both atoms want to gain two electrons.

Oxygen atoms are highly electronegative.

So both atoms want to gain two electrons.

OOBoth electron pairs are shared.

OO =For convenience, the double bond

can be shown as two dashes.

OO =This is the oxygen molecule,

A model

What is a covalent bond?

Atoms ___________ one or more electrons with each other to form the bond.

Each atom is left with a ________________ outer shell.

A covalent bond forms between two _________________.

Challenge 1: Flourine + FlourineChallenge 2: Hydrogen + HydrogenChallenge 3: Water

COMPLETE

NONMETALS

1. Dot and cross diagram2. Formula

Group 1 – The Alkali Metals Watch the demo. Write down your observations. Write down the chemical...

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