the Periodic table

Question 1

What are group 0 elements known as?

Answer 1

noble gases

Question 2

noble gases have full outer shells which means ….

Answer 2

they have a very stable electron configuration making them unreactive and do not easily form molecules

Question 3

boiling points of noble gases increases….

and why

Answer 3

with relative atomic mass (going down the group)

this is because the atoms get larger so the intermolecular forces between forces become stronger = more energy needed to overcome these forces

Question 4

What are group 1 elements known as?

Answer 4

alkali metals

Question 5

how many electrons does group 1 have in the outer shell?

Answer 5

1

Question 6

Group 1 boiling and melting point _______ as you go down the group

Answer 6

decreases

Question 7

Why does Group 1 become more reactive as you go down the group?

Answer 7

because the outer electron gets further away from the influence of the nucleus, so it can be lost more easily

Question 8

Why are alkali metals stored under oil?

Answer 8

because they react vigourously with oxygen and water, inclucding moisture in the air

Question 9

alkali metal + water =

Answer 9

metal hydroxide + hydrogen gas

Question 10

Group 1 metals have _________ density

Answer 10

low

Question 11

which group 1 metals float because they are less dense than water?

Answer 11

sodium, lithium and potassium

Question 12

metal hyrdoxide dissolved in water =

Answer 12

alkaline solution

Question 13

alkali metals + non-metals =

Answer 13

ionic compounds

Question 14

What are group 7 (which are non-metals) known as?

Answer 14

halogens

Question 15

why do group 7 elements have similar reactions

Answer 15

because they all have 7 electrons in their outer shell

Question 16

reactivity in group 7 elements ________ as you go down the group

Answer 16

decreases

Question 17

why does reactivity in group 7 elements decrease as you go down the group

Answer 17

because the outer shell gets further away from the nucleus, so it is less easy to gain an electron

Question 18

The further down Group 7 the element is ________ its relative molecular mass, melting point and boiling point

Answer 18

the higher

Question 19

Halogens + metals =

Answer 19

ionic salts

Question 20

what happens when halogens and metals react?

Answer 20

a halide ion with a negative charge (-1) is formed

Question 21

what happens when alkali metals react with non-metals?

ions

Answer 21

a metal ion with a positive charge (+1) is formed

Question 22

A more reactive halogen will __________ a less reactive halogen from an _____________ of its salt

Answer 22

displace

aqueous solution

Question 23

where are transtion metals?

Answer 23

in the centre of the periodic table, between groups 2 and 3

Question 24

what are the features of transition metals?

Answer 24

• form coloured compounds

- they have ions with different charges

Question 25

what are the properties of transition metals?

Answer 25

good conductors of heat and electricity
can be easily bent or hammered into shape
dense
strong
shiny

Question 26

what can transition metals be used for?

Answer 26

catalysts to speed up chemical reactions

Question 27

how did Newlands arrange the elements in the periodic table?

Answer 27

in order of atomic weight

Question 28

Why was ordering elements in order of atomic weight a bad thing?

Answer 28

because some of the elements were in the wrong place

Question 29

what did medeleev realised and what did he do

Answer 29

that some elements had yet to be discovered and left gaps to allow for their discovery

used the periodic table to predict the existence and properties of new elements

he also reordered some elements

Question 30

How did Mendeleev reorder the elements?

Answer 30

each element was placed in a group with elements that had similar properties

Question 31

what did scientists realise when subatomic particles were later discovered

Answer 31

that Mendeleev had organised the elemnts in order of increasing atomic number

Question 32

transition metals are ______ reactive than alkali metals

Answer 32

less