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Naming Compounds, cations and anions. Part 1 – The obvious ones:. Elements and symbols that you should know:. Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen. H He Li Be B C N. Oxygen Fluorine Neon Magnesium Aluminium Silicon Phosphorus. O F Ne Mg Al Si P.

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elements and symbols that you should know

Part 1 – The obvious ones:

Elements and symbols that you should know:

  • Hydrogen
  • Helium
  • Lithium
  • Beryllium
  • Boron
  • Carbon
  • Nitrogen

H

He

Li

Be

B

C

N

  • Oxygen
  • Fluorine
  • Neon
  • Magnesium
  • Aluminium
  • Silicon
  • Phosphorus

O

F

Ne

Mg

Al

Si

P

slide3

Some more obvious ones:

  • Sulphur
  • Chlorine
  • Argon

S

Cl

Ar

18) Calcium

19) Zinc

Ca

Zn

The less obvious ones:

  • Sodium
  • Potassium
  • Iron
  • Copper
  • Silver

Na

K

Fe

Cu

Ag

6) Tin

7) Gold

8) Mercury

9) Lead

Sn

Au

Hg

Pb

polyatomic ions 1 charge
Polyatomic ions (-1 charge)
  • NO31- Nitrate
  • OH1- Hydroxide
polyatomic ions 2 charge
Polyatomic ions (-2 charge)
  • SO42- Sulfate
  • CO32- Carbonate
slide7

This happens with the following elements:

  • H2
  • N2
  • O2
  • F2
  • Cl2
  • Br2

These elements always go around in pairs (diatomic molecules). For example, hydrogen looks like this:

Rule 1– If two identical elements combine then the name doesn’t change

slide8

Rule 2 – When two elements join and one is a halogen, oxygen or sulphur the name ends with ____ide

e.g. Magnesium + oxygen magnesium oxide

  • Sodium + chlorine
  • Magnesium + fluorine
  • Lithium + iodine
  • Chlorine + copper
  • Oxygen + iron
  • KBr
  • LiCl
  • CaO
  • MgS
  • KF
slide9

Rule 3 – When three or more elements combine and two of them are hydrogen and oxygen the name ends with hydroxide

e.g. Sodium + hydrogen + oxygen Sodium hydroxide

  • Potassium + hydrogen + oxygen
  • Lithium + hydrogen + oxygen
  • Calcium + hydrogen + oxygen
  • Mg(OH)2
slide10

Rule 4 – When three or more elements combine and one of them is oxygen the ending is _____ate

e.g. Copper + sulphur + oxygen Copper sulphate

  • Calcium + carbon + oxygen
  • Potassium + carbon + oxygen
  • Calcium + sulphur + oxygen
  • Magnesium + chlorine + oxygen
  • Calcium + oxygen + nitrogen
  • AgNO3
  • H2SO4
  • K2CO3
slide11

Covalent formulae

Ionic formulae

H2O

CO2

NH3

H2

O2

N2

SO2

Water

Carbon dioxide

Ammonia

Hydrogen

Oxygen

Nitrogen

Sulphur dioxide

NaCl

CaCl2

MgO

HCl

H2SO4

HNO3

NaOH

Ca(OH)2

CaCO3

Al2O3

Fe2O3

Sodium chloride

Calcium chloride

Magnesium oxide

Hydrochloric acid

Sulphuric acid

Nitric acid

Sodium hydroxide

Calcium hydroxide

Calcium carbonate

Aluminium oxide

Iron oxide