Chemical FormulaLO: Become familiar with the symbols of common elements and understand that elements

are made of atoms;

Swap your theory book with your partner Compare and discuss your answers with each other and mark each others homework

H He

LiNaK

RbCsFr

Be

Sc TiMg

V Cr Mn Fe Co Ni Cu Zn Ga Ge Se BrCa KrY Zr Nb Mo Tc Ru Pd Ag Cd In Sn SbSr TeRh

Ba Hf Ta W Re Os Ir Au Hg Tl Pb Bi PoLa AtPtRa Rf Db Sg Bh Hs Mt ? ?Ac ?

Al PN O

S ClF Ne

Ar

RnI

Si

Xe

B C

As

What is the Group and Period of this element?

MgC

Group 2 Group 4Group 7

ClK

Group 1MgCClK

Name the position

7654321 0

2345

67

Period 3Period 2Period 3Period 4

1

Q5. Name a gas in group 7 that is in the same period as Aluminium.

Q1. Name a metal in group 1 that is in the same period as Magnesium.

Q2. Name a metal in group 2 that in the same period as Lithium.

Q3. Name a non-metal in the same group as Nitrogen.

Q4. Name a noble gas in the same period as Oxygen.

Chemical formula of elements• Each element has a symbol.

• Some elements exist as particular numbers of atoms bonded together.

• This fact can be represented in a formula with a number which shows how many atoms.

O

N

H H H

P

N N

FormulaMoleculeAtom

O O

P PPP

O2

N2

H2

P4

Rule 1: When two elements combine the ending is usually ” ……………ide”. metal goes first

Sodium Chloride

Magnesium Oxide

Iron Sulph___

Na

Cl

Mg

O

Fe S

Rule 2: When three or more different elements combine and one of them is Oxygen, the ending will be “………ate”.metal goes first

Copper Sulphate

Calcium Carbonate

CuS

O

OO

O

Ca CO

O

O

Rule 3: When two identical elements combine, the name does not change.

H2 = Hydrogen

F2 = Fluorine

N2 = Nitrogen

Cl2 = Chlorine

O2 = Oxygen

H H

N N

O O

F F

Cl Cl

Name the following compounds/molecule

MgSO4ZnO

MgCl2

H2

KI

AgNO3

Na2O

CuSO4

Draw a line between the compound and its name:

Magnesium Carbonate NaCl

Magnesium Chloride

Iron sulphide

Lead nitrate

Copper sulphate

Sodium Chloride

Potassium Iodide

Calcium Carbonate

Pb(NO3)

2FeS

CuSO4

CaCO3

ZnF2

MgCO3

KI

Zinc Fluoride

MgCl2

1. How many atoms of Hydrogen in one molecule of Methane CH4 ?

2. How many atoms of Nitrogen in one molecule of Lead nitrate Pb(NO3)2 ?

3. Sodium oxide has two atoms of sodium for every atom of oxygen. What is the formula for sodium oxide?

4. Magnesium chloride has one atom of Magnesium for every two atoms of chlorine. What is the formula for Magnesium chloride?

5. How many atoms of Nitrogen in one molecule of Ammonia NH3 ?

WORD SPLAT PLENARY

N2 AgNO3KI

CaCO3Pb

KMagnesium

Au

H

Air

NaCl

Carbon dioxide

KNO3

Cl2CuSO4

Potential starter

• TASK: Use the periodic table in textbook 1 to find the name or symbol of these elements

Element name Symbol• Gold• Si• Ag

• Starter recap: questions

• Where can you find every element?

• Write down 3 chemical symbols of 3 elements of your choice?

• Write down and chemical formulas you can think of eg. H2O?