chapt 11 (periodic table)

Question 1

periodic table (3)

Answer 1

-> Period no. = number of shells
-> decrease in metallic properties & increase non metallic properties across the period.
-> going down a grp, inc. in metallic properties and dec. in non metallic properties. (size inc. outermost elect. further frm nucleus = lose elect easily)

Question 2

Group 1 (3) + going down grp (3)

Answer 2

Grp 1:
- soft, cut easily
- low m.p/ b.p
- low density
Go down the grp,
-> m.p of alkali metals decrease
-> reactivity inc.
-> density inc.

Question 3

Group 17 (4) + going down group (3)

Answer 3

Grp 17: Halogens
- diatomic
- low m.p/ b.p
- coloured
- undergo displacement reaction (more reactive halogen displaces less reactive frm halide sltn)
Go down the grp,
-> m.p/ b.p inc
-> reactivity dec.
-> colours are darker

Question 4

Group 18 (5)

Answer 4

Grp 18:
- monoatomic non metals
- colourless gas at room temp.
- low m.p/b.p
- insoluble in water
- unreactive