Chapter 7 Key Concepts

Question 1

What does period number tell us

Answer 1

The number of highest energy electron shell in an elements atom

Question 2

Factors affecting I.E.

Answer 2

Atomic radius
-greater the distance the less the attraction

Nuclear attraction to outermost electrons
-more protons means greater nuclear attraction

Electron shielding
-inner repel outer so reduces attraction between nucleus and outermost electrons

Question 3

What is successive ionisation energy evidence of

Answer 3

Energy levels

Question 4

What’s the trend in first ionisation across a period graph evidence of?

Answer 4

Sub shells and shells

Question 5

Trend in FIE down a group

Answer 5

• nuclear charge increases. It’s effect is outweighed by increased radius
• atomic radius increases
• shielding increases
• nuclear attraction decreases
• FIE decreases

Question 6

Trend in FIE across a period

Answer 6

• nuclear charge increases
• atomic radius decreases
• same shell so similar shielding
• nuclear attraction increases
• FIE increases

Question 7

Are giant covalent lattices soluble?

Answer 7

No. they’re insoluble in almost all solvents.

Con bonds far too strong to be broken by interaction with solvents