3.2.1 Periodicity

Question 1

What is the S block on the periodic table and what does it represent?

Answer 1

First 2 groups on the periodic table and it represent every element whose valent orbital is an s orbital

Question 2

What is the P block on the periodic table and what does it represent?

Answer 2

group 3 to group 7.
It represents all elements whose valent orbital is a p orbital

Question 3

What is the D block on the periodic table and what does it represent?

Answer 3

It is the transition metals and the d block represents all elements whose valent orbital is a d orbital

Question 4

What is the F block on the periodic table and what does it represent?

Answer 4

It is all the elements whose valent orbital is an f orbital

Question 5

What is the position of a element based on?

Answer 5

Proton number

Question 6

What is the trend of the atomic radius across period 3 (from Na to Ar)
and why?

Answer 6

Atomic radius decreases because the number of protons increases (nuclear charge) meanwhile the shielding remains the same so the electrons are pulled closer to the nucleus making the atomic radius smaller

Question 7

What is the trend of the First Ionisation energy across period 3 (from Na to Ar)
and why?

Answer 7

First ionisation increases as when you go across the period electrons experience a larger pull to the nucleus, therefore requiring more energy to remove them

Question 8

What is the trend of the melting point across period 3 (from Na to Ar)
and why?

Answer 8

The melting point increases from Na to Al and peaks at Si due to stronger metallic bonding (more delocalised electrons) and Si having a very high melting point due to strong covalent bonds in its Giant covalent structure

from P to Ar the Melting point decreases because of they are simple molecular substances that depend purely on van der waal forces