The Periodic Table

Question 1

What happens to atomic radius down Group 2 & why ?

Answer 1

• Increases
• Greater atomic number = more electrons = more shielding

Question 2

What is the difference in atomic radius between Group 1 & 2 ?

Answer 2

• Group 2 atoms are smaller
• Extra proton holds electrons closer to the nucleus

Question 3

What happens to ionic radius down Group 2 & why ?

Answer 3

• Increases
• Ions are smaller than atoms
• Remaining electrons are now in fewer shells

Question 4

What happens to melting point down Group 2 & why ?

Answer 4

• Decrease
• Each atom contributes 2 electrons to delocalised cloud
• Metallic bonding gets weaker due to increased size of ion

Question 5

What happens to first ionisation energy down Group 2 & why ?

Answer 5

• Decreases
• Extra shielding/ increasing atomic radius
• less energy required to lose electrons

Question 6

Which metal oxide has covalent character ?

Answer 6

BeO

Question 7

What happens to solubility down Group 2 ?

Answer 7

• Increases

Question 8

What happens when a metal oxide reacts with water ?

Answer 8

• Hydroxide is formed
  E.g:
  CaO + H20 = Ca(OH)2

Question 9

What colour is floruine, chlorine, bromine and iodine ?

Answer 9

F - yellow
Cl - green
Br - red/brown
I - grey

Question 10

What happens to the boiling point down the halogens ?

Answer 10

• Increases
• Larger size = Increased dipole-dipole interactions
• More energy is require to sepearate the molecules

Question 11

What happens to atomic radius down the halogens ?

Answer 11

• Increases
• Greater atomic number = more electrons in shells = increasingly futher from the nucleus

Question 12

What happens to ionic radius down the halogens ?

Answer 12

• Increases
• Ions larger than atoms = added electron repels the others = radius is larger

Question 13

What happens to electronegativity down the halogens ?

Answer 13

• Decreases
• Allthough has increasinng nuclear charge due to greater number of protons.
• There is increase in shells = more shielding = less pull
• Increasing atomic radius = attraction drops as distance increases

Question 14

What happens to oxidising power down the group ?

Answer 14

• Decreases
• Oxidising power (ability to gain electron - reduce)