Periodicity (3.2.1-Inorg.)

Question 1

Atomic radius

Answer 1

Decreases across a period

• Nuclear charge increases
• Same shielding

Question 2

Blocks

Answer 2

Groups 1 & 2= s block
Transition metals = d block
Non-metals = p block

Question 3

Electronegativity

Answer 3

Increases across a period

Decreases down a group

Question 4

1st IE

Answer 4

Increases across a period

atomic radius decreases, nuclear charge increases, same shielding

Question 5

Melting Point (1st 3 groups) [p3]

Answer 5

First 3 groups : increases

Highest ionic charge, most delocalised electrons, smaller ionic radius

Question 6

Melting point (Group 4) [p3]

Answer 6

Giant covalent (goes down)

Question 7

Melting point (group 5 onwards) [p3]

Answer 7

Decreases, only weak van der Waals forces btwn molecules (S8 slightly higher than P4 due to largeness)