Topic 3: Atomic Structure

Question 1

List the FOUR points that Dalton stated about the atom:

Answer 1

> All elements are made up of small invisible part clues called
atoms
Atoms cannot be created or destroyed
Atoms of different elements have different properties
When atoms combine they form molecules or compounds

Question 2

Why did J.J Thomson state that the atom was like a ‘Plum Pudding’?

Answer 2

The negative electrons were embedded in a positive sphere (like the raisins embedded in a plum pudding)

Question 3

What is the relative MASS of a Proton?

Answer 3

1

Question 4

What is the relative MASS of a neutron?

Answer 4

1

Question 5

What is the relative MASS of an electron?

Answer 5

1/1840

Question 6

What is the relative CHARGE of a Proton?

Answer 6

+1

Question 7

What is the relative CHARGE of a neutron?

Answer 7

0

Question 8

What is the relative CHARGE of an electron?

Answer 8

-1

Question 9

Where are the PROTONS found?

Answer 9

In the nucleus

Question 10

Where are the NEUTRONS found?

Answer 10

In the nucleus

Question 11

Where are the ELECTRONS found?

Answer 11

In the shells

Question 12

What is the ATOMIC NUMBER?

Answer 12

The number of protons in an atom

Question 13

What is the MASS NUMBER?

Answer 13

The total number of protons and neutrons in an atom

Question 14

What are ISOTOPES?

Answer 14

Isotopes are atoms of an element with the same atomic number but a different mass number, indicating a duffrebt number of neutrons

Question 15

Atoms with ELECTRIC charges are called:

Answer 15

Ions

Question 16

Atoms with POSTIVE charges are called:

Answer 16

Cations

Question 17

Atoms with NEGATIVE charges are called:

Answer 17

Anions