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Topic 6 Radioactivity

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

#1
Front (Question)

1 What is the difference between an atom and a molecule?

Back (Answer)

A molecule is two or more atoms bonded together.

#2
Front (Question)

2 What is an element?

Back (Answer)

substance where all atoms have the same atomic number/number of protons

#3
Front (Question)

3 What is the part in the middle of an atom called?

Back (Answer)

nucleus

#4
Front (Question)

4 Name two subatomic particles.

Back (Answer)

any two from: proton, electron, neutron

#5
Front (Question)

5 What are the negatively charged particles in an atom called?

Back (Answer)

electrons

#6
Front (Question)

6 What are the positively charged particles in an atom called?

Back (Answer)

protons

#7
Front (Question)

7 Where is most of the mass of an atom concentrated?

Back (Answer)

nucleus

#8
Front (Question)

8 Which subatomic particles have a negligible mass?

Back (Answer)

electrons

#9
Front (Question)

9 How did scientists discover that atoms had tiny nuclei?

Back (Answer)

fired particles at atoms/gold sheet

#10
Front (Question)

10 Who investigated atoms in this way?

Back (Answer)

Rutherford

#11
Front (Question)

11 Which of the following is approximately the diameter of an atom ? a hundredth of a millimetre, a thousandth of a millimetre or a millionth of a millimetre?

Back (Answer)

millionth of a millimetre

#12
Front (Question)

12 What charge do electrons have?

Back (Answer)

negative, or -1

#13
Front (Question)

13 How much mass do electrons have?

Back (Answer)

negligible / hardly any

#14
Front (Question)

14 In Thompson?s model, the atom was positively charged with tiny negative charges in it. What was this model called?

Back (Answer)

plum pudding model

#15
Front (Question)

15 Rutherford investigated the structure of the atom. What did he do?

Back (Answer)

He fired alpha particles at gold foil.

#16
Front (Question)

16 What happened to most of the alpha particles in Rutherford?s experiment?

Back (Answer)

went straight through

#17
Front (Question)

17 Why did Rutherford conclude that most of the mass of the atom was in the centre?

Back (Answer)

A few particles bounced back.

#18
Front (Question)

18 What is the relative mass of a proton?

Back (Answer)

1

#19
Front (Question)

19 What are isotopes?

Back (Answer)

atoms of the same element with different masses

#20
Front (Question)

20 Which subatomic particle has no charge?

Back (Answer)

neutron

#21
Front (Question)

21 What is another name for nucleon number?

Back (Answer)

mass number

#22
Front (Question)

22 What is the mass number of an atom?

Back (Answer)

total number of protons and neutrons

#23
Front (Question)

23 What is the atomic number of an atom?

Back (Answer)

number of protons

#24
Front (Question)

24 What is another name for atomic number?

Back (Answer)

proton number