3.1 The Periodic Table & Periodic Trends

Explain the following statement.

The first ionisation energy of potassium is smaller than the first ionisation energy of calcium.

Explain the following statement.

The first ionisation energy of potassium is larger in value than rubidium

Define the term electronegativity.

Define what is meant by the term electron affinity.

State whether first electron affinity is an exothermic or endothermic process.

Write an equation, including state symbols, for the first electron affinity of bromine.

State whether the first electron affinity of I is more or less exothermic than Br.

An element has the following electron configuration.

1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁴

The periodic table can be divided into blocks.

State why are silicon, carbon, oxygen and chlorine all classified as p-block elements.

State the general trend in first ionisation energies across period 3.

Antimony, Sb, has atomic number 51.

Using section 6 of the data booklet, complete the table to show where antimony is found in the periodic table.

Period	Block

Identify the element that is in the d-block of the periodic table which forms a 3+ ion with the following electron configuration.

[Ar] 3d³

Ionisation energies can provide evidence for electron structure.

Write an equation, including state symbols, for the first ionisation energy of chlorine.