Year 9, basics, paper 1&2

Question 1

The atom

Answer 1

• nucleus with protons and neutrons,
• electrons on shells.
• most is empty space.
• neutral charge

Question 2

Proton relative charge.

Answer 2

+1

Question 3

Proton relative mass

Answer 3

1

Question 4

Electron relative charge.

Answer 4

-1

Question 5

Electron relative mass

Answer 5

1/1836 or nothing

Question 6

Neutron relative charge

Answer 6

0

Question 7

Neutron relative mass

Answer 7

1

Question 8

John dalton

Answer 8

Thought atoms where:

• tiny hard spheres
• cant be broken down
• everything is made of these,
• cant be created or destroyed.

Question 9

JJ Thomson

Answer 9

Discovered sub-atomic particles.

Question 10

Atomic number =

Answer 10

Number of protons

Question 11

Number of protons =

Answer 11

Number of electrons (in an atom)

Question 12

Mass number =

Answer 12

Number of protons + neutrons

Question 13

Mass number - atomic number =

Answer 13

Number of neutrons

Question 14

Isotopes.

Answer 14

They are atoms which do not have the right amount of neutrons in there nucleus. So the atomic number and element remains the same however the mass number changes.

Question 15

How to find RAM

Answer 15

RAM = (mass number x % of them) + (mass number x % of them)
————————————————————————
100

Question 16

Rutherford

Answer 16

Discovered atoms were mainly empty space.

Question 17

In isotopes

Answer 17

• change of physical properties

- same chemical.

Question 18

Mendeleeves table was not believed at first why?

Answer 18

• metals where put with non metals
• switched some elements around.
• groupie 8 was missing.

Question 19

Periodic table nowadays

Answer 19

• ordered in atomic number
• still groups in chemical and physical properties.
• rows = period
• columns = groups
• metals on left, non metals right,

Question 20

Group 7

Answer 20

• halogens
• right, non metals
• toxic
• low melting
• poor conductors
• all look different.

Question 21

Group 1

Answer 21

• reactive the further down the group.
• on the left.
• called the alkali metals.