End Of Yr Chapter 2: Periodic Table

Question 1

How is the modern periodic table ordered?

Answer 1

By atomic number

Question 2

How were the early lists of elements ordered?

Answer 2

By atomic mass

Question 3

Why did Mendeleev swap the order of some elements?

Answer 3

To group them by their chemical properties

Question 4

Why do elements in a group have similar chemical properties?

Answer 4

Have the same number of electrons in their outer shell

Question 5

Why do elements in a group have similar chemical properties?

Answer 5

Have the same number of electrons in their outer shell

Question 6

Where are metals and non metals located on the periodic table?

Answer 6

Metals to the left non metals to the right

Question 7

What name is given to the group 1 elements?

Answer 7

Alkali metals

Question 8

Why are the alkali metals named this?

Answer 8

They are metals that react with water to form an alkali

Question 9

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

Answer 9

Metal + oxygen = metal oxide
Metal + chlorine = metal chloride
Metal + water = metal hydroxide + hydrogen

Question 10

How does the reactivity of the alkali metals change down the group?

Answer 10

Increases (more reactive)

Question 11

Why does the reactivity of the alkali metals increase down the group?

Answer 11

They are larger atoms so the outermost electron is further from the nucleus meaning there are weaker electrostatic forces of attraction and more shielding between the nucleus and outer electron and it is easier to lose the electron

Question 12

What name is given to the group 7 elements?

Answer 12

Halogens

Question 13

Give the formulae of the first four halogens

Answer 13

F2️⃣
Cl2️⃣
Br2️⃣
I2️⃣

Question 14

How do the melting points of the halogens change down the group

Answer 14

Increase (higher melting point)

Question 15

How does the reactivity of the halogens change down the group?

Answer 15

Decrease (less reactive)

Question 16

Why does the reactivity of the halogens decrease down the group?

Answer 16

They are larger atoms so the outermost shell is further from the nucleus meaning there are weaker electrostatic forces of attraction and more shielding between the nucleus and outer shell and it is harder to gain an electron

Question 17

What is a displacement reaction?

Answer 17

When a more reactive element takes the place of a less reactive one in a compound

Question 18

What name is given to the group 0 elements?

Answer 18

Noble gases

Question 19

Why are the noble gases inert?

Answer 19

They have full outer shells so do not need to lose or gain electrons

Question 20

How do the melting points of the noble gases change down the group?

Answer 20

Increase (higher melting point)