U1-2-0 - N4 Revision

Question 1

Name of group 1 in the periodic table

Answer 1

Alkali metals

Question 2

Name of group 7 in the period table

Answer 2

Halogens

Question 3

Name of group 0/8 in the periodic table

Answer 3

Noble gases

Question 4

List the diatomic elements (there are 7)

Answer 4

H₂ N₂ O₂ F₂ Cl₂ Br₂ I₂

Question 5

A proton has a mass of ….. and a charge of …. .

Answer 5

mass = 1

charge = +1

Question 6

A neutron has a mass of …. and a charge of …. .

Answer 6

mass = 1

charge = 0

Question 7

An electron has a mass of …. and a charge of …. .

Answer 7

mass = 0

charge = -1

Question 8

Atomic number

Answer 8

The number of protons. Defines an element.

Question 9

Mass number

Answer 9

The number of protons and neutrons

Question 10

Why are atoms neutral?

Answer 10

Equal number of protons and electrons.

+ and - charges cancel out.

Question 11

In the nuclide notation shown, 17 is the …

Answer 11

Atomic number

Question 12

In the nuclide notation shown, 35 is the …

Answer 12

Mass number

Question 13

What is a valence electron?

Answer 13

An electron in the outermost electron shell (furthest from the nucleus).

Question 14

Ion

Answer 14

A charged atom formed when an atom has gained or lost electrons

Question 15

Why do atoms form ions?

Answer 15

To gain a full outer shell of electrons.

This makes them more stable.

Question 16

Ions have the same electron arrangement as the nearest ….

Answer 16

Noble gas

Question 17

Explain why noble gases do not form ions.

Answer 17

They already have a full outer shell.

Question 18

The number of protons. Defines an element.

Answer 18

Atomic number

Question 19

The number of protons and neutrons

Answer 19

Mass number

Question 20

A charged atom formed when an atom has gained or lost electrons

Answer 20

Ion

Question 21

State the structure of noble gases.

Answer 21

Monatomic (exist as single atoms).

Question 22

How do you calculate the number of neutrons in an atom?

Answer 22

No. of neutrons = Mass number – Atomic number

Question 23

Are metal ions positive or negative?

Answer 23

Positive

Question 24

Are non-metal ions positive or negative?

Answer 24

Negative

Question 25

The charge number of an ion is equal to the element’s …

Answer 25

valency.

(e.g. O has valency 2, and charge 2–)