Chemistry-OCR A-January 2026 Mocks

State the 3 ways the periodic table is arranged

Increasing atomic number, repeating patterns and trends of physical and chemical properties and in groups with similar chemical properties

Define 1st ionisation energy

The energy required to remove 1 mole of electrons from 1 mole of gaseous atoms to form 1 mole of gaseous 1+ ions

Write 1st ionisation energy equation for sodium

Na (g) --> N (g) + e-

Describe how ionisation energy changes for BOTH across a period and down a group

Across the period IE increases

Down group IE decreases

Describe the 4 factors you always need to mention in an Ionisation energy Q

Nuclear charge

Atomic radius

Shielding

Nuclear attraction

TRUE OR FALSE: Nuclear charge decreases down a group

FALSE