Year 9, basics, paper 1&2 Flashcards Preview

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Flashcards in Year 9, basics, paper 1&2 Deck (21)
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1

The atom

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

2

Proton relative charge.

+1

3

Proton relative mass

1

4

Electron relative charge.

-1

5

Electron relative mass

1/1836 or nothing

6

Neutron relative charge

0

7

Neutron relative mass

1

8

John dalton

Thought atoms where:
- tiny hard spheres
- cant be broken down
- everything is made of these,
- cant be created or destroyed.

9

JJ Thomson

Discovered sub-atomic particles.

10

Atomic number =

Number of protons

11

Number of protons =

Number of electrons (in an atom)

12

Mass number =

Number of protons + neutrons

13

Mass number - atomic number =

Number of neutrons

14

Isotopes.

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.

15

How to find RAM

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

16

Rutherford

Discovered atoms were mainly empty space.

17

In isotopes

- change of physical properties
- same chemical.

18

Mendeleeves table was not believed at first why?

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

19

Periodic table nowadays

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

20

Group 7

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

21

Group 1

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