Atomic Theory

Question 1

What’s an isotope ?

Answer 1

Atoms of an element that have the same number of protons and a different number of neutrons

Question 2

Democriticus was who ?

Answer 2

A 5th century greek philosopher who found out that elements contain the tiny particles of atoms

Question 3

Who created the solid sphere model ?

Answer 3

John Dalton in 1893

Question 4

What model did J.J Thompson create ?

Answer 4

The plum pudding model
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- + -
- -
-

Question 5

Who created what model in 1911?

Answer 5

Earnest Ruthford - nuclear model

Question 6

Niels Bohr created what model in 1913?

Answer 6

The planetary model

(Shells surrounding positive nucleus )

Question 7

Erwin Schrödinger designed what atomic model when?

Answer 7

Quantum Model in 1926

Question 8

What did Chadwick do In 1932?

Answer 8

Applying the laws of conservation of mass & energy he deduced that the mystery particles remaind unchanged

Question 9

How many atoms belong in first shell?

Answer 9

2

Question 10

How many atoms belong in the 2nd shell?

Answer 10

8

Question 11

How many atoms belong in the 3rd shell?

Answer 11

8

Question 12

How many atoms belong in the fourth shell?

Answer 12

18

Question 13

How do you work out relative atomic mass?

Answer 13

(Mass x%) + (mass2 x %)
————————————
100

Question 14

Properties of a proton?

Answer 14

Found in nucleus
Relative mass of 1
Relative charge +1

Question 15

Properties of a neutron

Answer 15

Found in nucleus
Relative mass of 1
Relative charge 0

Question 16

Properties of an electron

Answer 16

Found in shells
Relative mass negligible
Relative charge -1

Question 17

Calculation for the relative formula mass?

Answer 17

1 work out number of each element
2 find relative atomic mass on periodic table
3 multiply steps one 1&2
4 add together relative atomic masses
5 step 3 decided by step 4 x 100

Question 18

What are the names of the three types of Hydrogen

Answer 18

H. 2H. 3H

hydrogen peutruim. Tritiam

Question 19

Why do most of the alpha particles pass through gold atoms ?

Answer 19

As most of the space inside is empty

Question 20

Why do some alpha particles deflect or bounce back

Answer 20

Due to repellent force between nucleus positive charge and

Question 21

Define the term atomic number

Answer 21

The number of protons

Question 22

Define the term mass number

Answer 22

Protons + neutrons

Question 23

The number of protons are also =_____________

Answer 23

Electrons