How have our ideas about atoms changed over time? test questions - OCR 21st Century - GCSE Combined Science Revision

1

Who suggested that all matter was made of different combinations of four elements?

Ancient Greeks

J J Thomson

John Dalton

2

What was the name of the atomic model proposed by Thomson?

Electron shells

Plum pudding

Central nucleus

3

What is the relative mass of a neutron?

1

2

0.0005

4

What is the charge of a neutron?

+1

-1

0

5

Where is most of the mass of an atom located?

Nucleus

Neutrons

Electron shells

6

What is the order of magnitude estimate for the size of a typical atom?

10¹⁰ m

10^-10 m

0.000,000, 000,144 m

7

How many protons are there in an atom of lithium (mass number 9, atomic number 3)?

9

3

6

8

How many electrons are there in an atom of sodium (mass number 23, atomic number 11)?

11

12

23

9

How many neutrons are there in an atom of hydrogen (mass number 1, atomic number 1)?

1

0

2

10

What is different about the isotopes of an element?

Number of protons

Number of electrons

Number of neutrons