Unit1Topic2 - Atomic Structure

Question 1

Dalton’s theory stated

Answer 1

All elements are made up of small, indivisible particles called atoms

Question 2

J.J. Thomson

Answer 2

Plum pudding model

The negative electrons were embedded in a positive sphere

Question 3

Rutherford

Answer 3

Model had negative electrons orbiting a positive nucleus

Question 4

Chadwick

Answer 4

Discovered the neutron

Question 5

Proton:
relative mass
relative charge
position

Answer 5

1
+1
Nucleus

Question 6

Neutron:
relative mass
relative charge
position

Answer 6

1
0
Nucleus

Question 7

Electron:
relative mass
relative charge
position

Answer 7

1/1840
-1
shells

Question 8

Atomic number definition

Answer 8

The total number of protons in an atom

Question 9

Mass number definition

Answer 9

The number of protons and neutrons in an atom

Question 10

Isotopes definition

Answer 10

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

Question 11

There are two common isotopes of chlorine:

Answer 11

Chlorine 35

Chlorine 37

Question 12

Atoms into ions

Answer 12

When atoms either lose or gain electrons they form ions

Question 13

Cation definition

Answer 13

Positive ions formed when atoms lose electrons

Question 14

Anions definition

Answer 14

Negative ions formed when atoms gain electrons

Question 15

Noble gases

Answer 15

Have filled outer shells giving them stability

Question 16

General rule:
Metals form … ions
Non-metals form … ions

Answer 16

Metals form positive ions

Non-metals form negative ions