Periodic Table

Question 1

Trends across the period

Answer 1

—> no of protons increases
—> metallic properties decreases
—> electron shells remain constant
—> atomic radius decreases

Question 2

Trend down the group

Answer 2

—> no of protons increases
—> metallic properties remain constant
—> valence electrons remain constant
—> electron shells increases
—> atomic radius increases

Question 3

Physical properties of transition metals

Answer 3

—> high melting and boiling point
—> conduct electricity and heat
—> form coloured compounds

Question 4

Chemical properties of transition metals

Answer 4

—> multiple oxidation States as a a-result it is used in catalyst

Question 5

What are alkali metals

Answer 5

—> react with water to give alkaline solution

—> group 1

Question 6

Physical properties of alkali metals

Answer 6

—> low melting point 
—> low densities 
—> shiny and silvery solids 
—> soft solids which Can be cut 
—> conduct electricity
—> high thermal conductivity

Question 7

What are halogens

Answer 7

—> diatomic molecules

—> group 7

Question 8

What are the physical properties of halogens ?

Answer 8

—> low melting and boiling point increasing down the group
—> density increases down the group
—> non conductor of electricity
—> dissolves in organic solvents

Question 9

What are the chemical properties of halogens

Answer 9

—> undergo displacement reaction

—> reactivity decreases down the group

Question 10

What are noble gases

Answer 10

—>unreactive and inert elements due to their stable electronic configuration
—> group zero

Question 11

Physical properties of noble gases

Answer 11

—> do not conduct electricity
—> very low melting and boiling point which increases down the group
—> density increases down the group

Question 12

Uses of noble gases

Answer 12

Helium is used to fill airships as it is lighter that air

Neon is used in the interior of light tubes as it is an unreactive gas

Argon is used to fill light bulbs as it is unreactive