Trends in periodic table

Question 1

Atomic Radius

Answer 1

half the distance between the nuclei of 2 atoms of the same element that are joined together by a single covalent bond.

Question 2

First Ionisation Energy

Answer 2

minimum energy required to completely remove the most loosely-bound electron from a neutral gaseous atom in its ground state.

Question 3

Second ionisation energy

Answer 3

energy required to remove an electron from an ion with one positive charge in the gaseous state.

Question 4

Does atomic radius increase or decrease down the group? Why? Give 2 reasons.

Answer 4

Increases.
Atomic number increasing/ Screening effect of inner shells/ Increase in nuclear charge

Question 5

Does atomic radius increase or decrease across the period? Why? Give 2 reasons.

Answer 5

Decreases.
Effective nuclear charge/no screening effect.

Question 6

Does ionisation increase or decrease down the group? Why? Give 2 reasons.

Answer 6

Decreases.
Increased atomic radius/ Screening effect

Question 7

Does ionisation increase or decrease across the period? Why? Give 2 reasons.

Answer 7

Increases.
Increasing nuclear charge/decreasing atomic radius

Question 8

Does electronegativity increase or decrease down the group? Why? Give 2 reasons.

Answer 8

Decreases.
Increased atomic radius/ Screening effect

Question 9

Does electronegativity increase or decrease across the period? Why? Give 2 reasons.

Answer 9

Increases.
Increasing nuclear charge/decreasing atomic radius