Chapter 9 The Periodic Table

Question 1

Use of periodic table

Answer 1

classify elements and predict their properties

Question 2

Define metalloids

Answer 2

elements that exhibit characteristics of both metals and non - metals

Question 3

Properties of metals (5)

Answer 3

large atomic radius

shiny

conduct heat and electricity

Generally high melting point

malleable and ductile

Question 4

Properties of non - metals (5)

Answer 4

smaller atomic radius

dull

doesn’t conduct heat and electricity

Generally low melting point

brittle

Question 5

Group I metals are also known as ____

Answer 5

Alkali metals

Question 6

Relationship between group number and valence electrons

Answer 6

The group number is the same as the amount of valence electrons

Question 7

Relationship between period number and number of electron shells

Answer 7

elements in the same period have the same number of electron shells

Question 8

Trends in Group 1 of the periodic table (3)

Answer 8

■Reactivity with water
Very reactive (the more easily an electron is lost, the more reactive it is) , reactivity increases down the group
■Density of Alkali metals
low density, density increases down the group
■Melting points of alkali metals
Relatively low, melting point decreases down the group

Question 9

Group VII metals are also known as _____

Answer 9

halogens

Question 10

Halogens are diatomic

True or False

Answer 10

True

Question 11

What are the colour of halogens like? (3)

Answer 11

Chlorine - gas with a green colour

Bromine - liquid with a dark red colour

Iodine - Solid with purple colour

As you go down the group, colour of darkness increases down the group

Question 12

What are the densities of halogens like?

Answer 12

Density increases down the group because of the changes of the state in the group

Question 13

What is the melting point of halogens like

Answer 13

melting point increases down the group

Question 14

What is the reactivity of halogens like

Answer 14

Very reactive non-metals, reactivity decreases down the group

Reason: Halogens need one more electron to gain a full electron shell. Going down a group, an extra electron shell is added making it difficult to attract an electron and hence decreases reactivity

Question 15

Define displacement reactionThe

Answer 15

A reaction where a less reactive element is removed from a compound by a more reactive element.

Question 16

Displacement of halogens

Answer 16

halogens higher in the group displaces the halogens lower

Question 17

The group 8/0 elements are also known as _______

Answer 17

Noble gases

Question 18

Feature of noble gas

Answer 18

Unreative ( full outer electron shell)

Exist as single atoms (monatomic)

Question 19

Use of helium

Answer 19

balloons at fairgrounds (helium less than air, so floats)

Question 20

Use of neon

Answer 20

advertising as it glows when electricity flows through

Question 21

Use of argon

Answer 21

lamps filled with argon to stop the filament reacting with air. If it reacts the atmosphere would heat up, causing it to burn

Question 22

Properties of transition metals (4)

Answer 22

high densities

high to very high melting points

not very reactive

forms coloured compounds

Question 23

Use of transition metals

Answer 23

used as catalyst