Atomic structure - OCR Gateway

1

Which of Dalton's ideas about atoms is no longer thought to be true?

2

What did the Geiger-Marsden experiment show?

3

Which particles are found in the nucleus of most atoms?

4

Which of these subatomic particles has the least mass?

5

Why are most atoms neutral?

6

How many protons, electrons and neutrons are in an atom which has an atomic number of 11 and a mass number of 23?

7

Which of these describes isotopes of an element?

8

Which of these pairs of atoms are isotopes of the same element?

9

What is the name for charged particles formed when atoms lose or gain electrons?

10

An aluminium ion, Al3+, contains 13 protons. How many electrons does an aluminium ion contain?