Periodicity and Reactivity

Question 1

The Noble Gases properties

Answer 1

Least reactive
Colourless
Monatomic
Highest IE
Low electron affinities

Question 2

Physical Properties of Alkali Metals

Answer 2

Good conductors
Low densities
Low melting points
Soft
Melting and boiling points decrease down a group
Reactivity increases down a group

Question 3

Chemical Properties of Alkali Metals

Answer 3

Form ionic compounds
All solids at room temp
Oxidized
Reactions with water become more vigorous down a group

Question 4

Reaction of group 1 metals with water

Answer 4

Produce metal hydroxide and hydrogen gas
Basic

Question 5

Physical properties of the Halogens

Answer 5

Diatomic
F and Cl are gases, Br os a liquid, I and At are solids
Melting and boiling points increase down the group

Question 6

Halogens colours

Answer 6

F - Pale yellow
Cl- Green yellow
Br - reddish brown
I - purple

Question 7

Chemical properties of the Halogens

Answer 7

Very reactive
Reactivity decreases down the group because the radius decreases

Question 8

Reactions between halogens and halides

Answer 8

The atomic radius increases down a group so the ability to gain electrons decreases
The halogens with the smaller atomic radius displaces the other

Question 9

Precipitation of halides

Answer 9

Halogen ions for a precipitate when they are mixed in a solution of Ag+

Question 10

Ionic character of period 3 oxides

Answer 10

Decreases in ionic character left to right

Question 11

Maximum oxidation state for period 3 elements

Answer 11

Equal to their group number

Question 12

Acid Base of period 3 oxides

Answer 12

Na and Mg are basic
Al is amphoteric
Si, P, S and Cl are acidic

Question 13

pH of rain

Answer 13

5.6

Question 14

What creates acid rain

Answer 14

Sulfur oxides and nitrogen oxides