Periodicity

Question 1

What is atomic radius?

Answer 1

A measure of the size of an atom, it is the mean distance between the nucleus and the edge of the electron cloud
It is dependent on charge and the number of shells and sub shells

Question 2

Atomic radius … across a period and … down a group

Answer 2

Decreases across a period and increases down a group

Question 3

Ionisation … across a period and … down a group

Answer 3

Increases across a period and decreases down a group

Question 4

Electronegativity … across a period and … down a group

Answer 4

Increases across a period and decreases down a group

Question 5

Define valence

Answer 5

The outermost electron on the outer shell

Question 6

Define ionisation energy

Answer 6

The energy required to remove one mole of electron from one mole of gaseous atom

Question 7

Half filled sub shells require more energy to remove electrons and therefore have a … ionisation energy

Answer 7

Higher

Question 8

Define electronegativity

Answer 8

A measure of the tendency of an atom to attract a bonding pair of electrons

Question 9

What scale is electronegativty measured on?

Answer 9

The Pauling Scale (0.7-4)