1.1 - Periodicity

Question 1

What is an increased nuclear charge

Answer 1

When there are more protons in the nucleus which causes a greater attraction and pulls the electrons closer together

Question 2

What is the first ionisation energy

Answer 2

The energy required to remove one mole of electrons from one mole of atoms in the gaseous form

Question 3

What is electronegativity

Answer 3

A measure of an atoms attraction for a shared pair of electrons in a bond

Question 4

Atomic size _______ across a period

Answer 4

Decreases

There are more protons in the nucleus which means a stronger attraction for electrons and pulls them closer together

Question 5

Atomic size ______ down a group

Answer 5

Increases

There are more energy levels, the outermost electrons are screened from the positive nuclear charge

Question 6

Ionisation energy ______ across a period

Answer 6

Increases

There are more protons in the nucleus which increase the nuclear charge and hold the protons tighter, therefore more energy is required to remove electrons

Question 7

Ionisation energy _____ down a group

Answer 7

Decreases

There are more energy levels and the outermost electrons are screened from the nuclear charge which makes them easier to remove

Question 8

Electronegativity _____ across a period

Answer 8

Increases

There are more protons in the nucleus which means a stronger nuclear charge.

Question 9

Electronegativity _____ down a group

Answer 9

Decreases

Increase in energy levels means that the outermost electrons are screened more from the positive nucleus and held less tightly