C2 Periodic Table

Question 1

How are the elements ordered in the periodic table (periods and groups)

Answer 1

(Periods) In order of increasing atomic number (number of protons in the nucleus)
(Groups) the number of electrons on the outer shell

Question 2

Are nobel gasses reactive or unreactive

Answer 2

Unreactive

Question 3

What are the first three elements in the periodic table

Answer 3

Lithium
Sodium
Potassium

Question 4

What group of elements are most reactive and why

Answer 4

Alkali metals are most reactive because all of the elements have 1 electron on the outer shell meaning it is easier for the element to lose that electron and gain a full outer shell

Question 5

Give 3 characteristics of group 1 metals

Answer 5

Soft
Reactive
Low melting point

Question 6

What happens when group 1 metals react with water

Answer 6

They form positive ions with a +1 charge by losing their single outer electron

Question 7

Why are nobel gasses unreactive

Answer 7

Nobel gasses already have a full outer shell of electrons so they dont need to lose or gain an electron to have a succesful full outer shell

Question 8

What are the first 3 elements in group 7

Answer 8

fluorine (F), chlorine (Cl), bromine (Br)

Question 9

What are the main properties of halogens

Answer 9

Low melting and boiling points
Very reactive
Non-metals

Question 10

What is the trend in reactivity in group 1

Answer 10

Elements become more reactive the further you go down the group because the outer electron gets further away from the nucleus

Question 11

What is the trend in reactivity in group 7

Answer 11

The halogens become less reactive the lower you go down the group because the atomic mass of the halogens increases

Question 12

Why do elements in group 7 react similarly

Answer 12

Because they all have 7 electrons on their outer shell