2010 Atoms, Bonds and Groups Jan

Question 1

Orbital

Answer 1

A region around nucleus that can hold up to two electrons with opposite spins

Question 2

Addition of Cl2 to I-
Addition of Cl2 to Br-
Addition of Br2 to Cl-

Answer 2

Purple
Orange
Orange

Question 3

The trend of thermal decomposition of carbonates in group 2

Answer 3

The ease of thermal decomposition decreases down a group

Question 4

Explain why NF3 has a permanent dipole

Answer 4

F is more electronegative than N

Dipoles do not cancel out

Question 5

Atomic radii across period 2

Answer 5

Atomic radii decreases
The nuclear charge increases
The attraction between outermost electrons and nuclei increases. Greater nuclear charge
Shielding remains the same