C2 Periodic Table

Question 1

Properties of group 0 elements

Answer 1

They are very unreactive (inert) as they don’t bond to for molecules
Boiling points increase downthe group

Question 2

Group 1 properties

Answer 2

Reactivity increases the further down the group and melting/boiling points decrease the further down the group

Question 3

What are group 7 elements (halogens)

Answer 3

They are non-metals that exist as molecules made up of pairs of atoms
For example fluorine is F2 and chlorine is Cl2

Question 4

Why do group1 elements (alkali metals) increase in reactivity down the group

Answer 4

Reactivity increases the furtherdown the group as
1. The atoms increase in size
2. There are more shells sheilding the nucleus
3. The electrostatic attraction between the nucleus and the outer electron is weaker

Question 5

Group 7 (halogens) properties

Answer 5

Reactivity decreases down the group
Melting/boiling point increases down the group

Question 6

Group 7 (halogens) reactivity and why

Answer 6

Reactivity decreases down Group 7 because as you move down the group:
• the atoms increase in size

• the outer shell is further away from the nucleus, and there are more shells
between the nucleus and the outer shell

• the electrostatic attraction from the nucleus to the outer shell is weaker so it is
harder to gain one electron to fill the outer shell.

Question 7

Give the general equations for the reactions of alkali metals with oxygen, chlorine, and water.

Answer 7

metal + oxygen ➞ metal oxide
metal + chlorine ➞ metal chloride
metal + water ➞ metal hydroxide + hydrogen

Question 8

John dalton’s periodic table

Answer 8

He arranged the elements in order of atomic weights

Question 9

Jhon Newlands periodic table

Answer 9

He also arranged the known elements in order of mass but he niticed every eighth element had similar properties. He produced his ‘law of octaves’ though not all elements were found yet and some elements wern’t similar he still filled every part of it.

Question 10

Mendeleev’s breakthrough

Answer 10

He placed the atomis in order of atomic weight and arranged themso that a periodic pattarn in the elements properties could be seen. He left gaps for elements that had yet to be discovered and predicted their properties.