1.1.3 Structure of atoms

Which of the following sentences describes a proton?

Use Table 2 to work out which of the following particles make up an atom of carbon-13.

Table 2

Atomic number Z	Mass number A	Isotope name	Isotope symbol
1	1	hydrogen	H
1	2	deuterium	H
2	3	helium-3	He
2	4	helium-4	He
3	7	lithium-7	Li
4	7	beryllium-7 (unstable)	Be
4	8	beryllium-8 (unstable)	Be
4	9	beryllium-9	Be
5	11	boron-11	B
6	12	carbon-12	C
6	13	carbon-13	C
6	14	carbon-14 (unstable)	C
7	14	nitrogen-14	N
8	16	oxygen-16	O

Using Table 3, what is the difference between an atom of beryllium-8 and beryllium-9?

Table 3

Atomic number Z	Mass number A	Isotope name	Isotope symbol
1	1	hydrogen	H
1	2	deuterium	H
2	3	helium-3	He
2	4	helium-4	He
3	7	lithium-7	Li
4	7	beryllium-7 (unstable)	Be
4	8	beryllium-8 (unstable)	Be
4	9	beryllium-9	Be
5	11	boron-11	B
6	12	carbon-12	C
6	13	carbon-13	C
6	14	carbon-14 (unstable)	C
7	14	nitrogen-14	N
8	16	oxygen-16	O