Periodic Trends

Question 1

Atoms get ____ going across a period.

Answer 1

Atoms get SMALLER going across a period

Question 2

Atoms get _____ going down a group

Answer 2

Atoms get LARGER going down a group

Question 3

What to mention in an atomic radii question?

Answer 3

1. Relevant Trend
2. No. of energy levels/shielding effect
3. Nuclear Charge
4. Distance between nucleus and valence electrons.

Question 4

What is Ionisation energy?

Answer 4

The energy needed to remove ONE ELECTRON from each atom in ONE MOLE of atoms in the GASEOUS state.

Question 5

I.E generally ____ going across a period

Answer 5

I.E generally INCREASES going across a period

Question 6

I.E generally ____ going down a group

Answer 6

I.E generally DECREASES going down a group

Question 7

What is Electronegativity?

Answer 7

A measure of the attraction that atoms have for their bonding electrons.

Question 8

What is electronegativity affected by

Answer 8

1. Nuclear Charge - stronger pull on electrons - increased net electrostatic attraction.
2. No. of Energy Levels - more energy levels, decreased net electrostatic attraction - valence electrons experience less attraction to thenucleus of other atoms