Periodicity

Question 1

State and explain the trend in melting and boiling point from sodium to aluminium

Answer 1

It increase because of the strength of the metallic bond this is because the charge of the ion increases and so more delocalised electrons can join the metallic lattice

Question 2

State why silicon has such a large melting point

Answer 2

It’s a macromolecule structure with many electrons meaning the size of van der waals forces increases meaning a lot energy is needed to overcome these binds

Question 3

State and explain the trend in atomic radi across a period

Answer 3

It reduces

Because across a period nuclear charge increases as more protons are added meaning outer shells are more attracted to the charge of the nucleus meaning they are pulled closer to it

Question 4

Why does atomic raid increase down a group

Answer 4

This is because an extra main level of electrons is added making the atom larger