The Atom

Question 1

The plum pudding is and was found by

Answer 1

There is positively charged pudding with negative charged particles inside and was created by jj Thomson

Question 2

The gold foil experiment

Answer 2

This experiment disproved the plum pudding model. They fired positively charged alpha particles at a thin sheet of gold. The particles went in 3 directions: straight through,deflected sideways or deflected backwards. This disproves the plum pudding because it should have mostly passed through but it didn’t

Question 3

Rutherford model

Answer 3

From the gold foil experiment came a new theory:
Their was a positively charged center
Was surrounded by a cloud of negativity electrons
Mostly empty space

Question 4

Bohr model

Answer 4

It is the most up to date model,it is very close to our current version
Electrons in shell around the nucleus
A positively charged center

Question 5

Atoms contain and there properties

Answer 5

Relative Mass > relative charge

• protons> 1 > +1
• neutrons> 1 > 0
• electrons> negligible > -1

Question 6

Atomic number is

Answer 6

The number of protons

Same as electrons

Question 7

Mass number is

Answer 7

Neutrons + protons

Mass of the nucleus

Question 8

Isotopes are

Answer 8

Different forms of the same element which have the same number of protons but different number of neutrons
Or has the same atomic numbers but different mass number

Question 9

The relative atomic mass of

Answer 9

An element is the average mass of one atom of the element

Question 10

How to work out the Ar

Answer 10

Multiply each relative isotopic mass by its isotopic abundance
Divide by its isotopic abundance