Periodicity

Question 1

What are the different blocks on the periodic table

Answer 1

s, p, d and f

Question 2

What is the trend for atomic radius across period 3

Answer 2

Further right the element is, the shorter the radius as number of protons increase (same shielding, more protons)

Question 3

What is the trend for ionisation energy across period 3

Answer 3

Increase in energy from left to right due to strong attraction, but dips for p1 and p4

Question 4

What is the trend for melting points across period 3

Answer 4

lowest melting point from Ar, Cl, P, S, Na, Mg, Al, Si

Question 5

Explain the trend for m.p. from Na to Al

Answer 5

Increasing m.p. as more electrons for stronger attraction in the metals

Question 6

Explain the m.p. for Si

Answer 6

Highest m.p. due to its macromolecular structure

Question 7

Explain the trend for m.p. of P, S and Cl

Answer 7

S exists as S8, P exists as P4, Cl exists as Cl2, so higher m.p. has more bonds(S>P>Cl)

Question 8

Explain the m.p. for Ar

Answer 8

Lowest m.p. due its monoatomic structure