U5 - Periodicity

Question 1

What happens when you move from left to right across period 3:

Answer 1

Atomic number increases
One extra electron in outer shell
Same outer shell
Atomic radii becomes smaller due to stronger nuclear attraction

Question 2

How does a nuclear charge increase

Answer 2

increases due to the extra proton and the extra electron

Question 3

What happens going down a group.

Answer 3

• atomic radius increases as you move down a group. (extra shell)
  -changes in reactivity - reactivity generally increases down a group in metals and a decrease in reactivity down a group in non-metals