December 16, 2022
Let's revise structure of an atom according to the I/GCSE chemistry curriculum!
Atomic/Proton Number – Number of protons (small number)
Mass Number – Sum of protons and neutrons
Mass Num – Atomic Num = Number of neutrons
Number of protons = number of electrons
ELECTRONS
- Held on energy levels
- First level can only hold 2 electrons
- After the first the rest of the energy levels can hold 8
- Electrons heavily influence the chemical properties of an element
Electrolytes are substances that conduct electricity when molten or in solution (ionic) in I/GCSE chemistry
ISOTOPES
- An atom with the same number of protons but a different of neutrons
- Relative Isotopic Masses
- E.g 75% of Cl is 35 type. 25% is Cl 37
- (0.75x35) + (0.25x37) = 35.5
IONS
- An element that has gained or loss electrons to complete its outer shell
- N.B Elements are arranged in order of Atomic Mass (Number of protons) in I/GCSE chemistry
Reactivity Series
Mnemonic: KNCMACZFSPHCAAP
Kangaroos Never Call Me A Cowardly Zebra For Several Plausible Honest Causes As Accurately Portrayed
End of this topic!