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
Q

The atom

A
  • nucleus with protons and neutrons,
  • electrons on shells.
  • most is empty space.
  • neutral charge
2
Q

Proton relative charge.

A

+1

3
Q

Proton relative mass

A

1

4
Q

Electron relative charge.

A

-1

5
Q

Electron relative mass

A

1/1836 or nothing

6
Q

Neutron relative charge

A

0

7
Q

Neutron relative mass

A

1

8
Q

John dalton

A

Thought atoms where:

  • tiny hard spheres
  • cant be broken down
  • everything is made of these,
  • cant be created or destroyed.
9
Q

JJ Thomson

A

Discovered sub-atomic particles.

10
Q

Atomic number =

A

Number of protons

11
Q

Number of protons =

A

Number of electrons (in an atom)

12
Q

Mass number =

A

Number of protons + neutrons

13
Q

Mass number - atomic number =

A

Number of neutrons

14
Q

Isotopes.

A

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
Q

How to find RAM

A

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

16
Q

Rutherford

A

Discovered atoms were mainly empty space.

17
Q

In isotopes

A
  • change of physical properties

- same chemical.

18
Q

Mendeleeves table was not believed at first why?

A
  • metals where put with non metals
  • switched some elements around.
  • groupie 8 was missing.
19
Q

Periodic table nowadays

A
  • ordered in atomic number
  • still groups in chemical and physical properties.
  • rows = period
  • columns = groups
  • metals on left, non metals right,
20
Q

Group 7

A
  • halogens
  • right, non metals
  • toxic
  • low melting
  • poor conductors
  • all look different.
21
Q

Group 1

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