The table gives some information about the three types of subatomic particle found in an atom of oxygen.
| Particle | Relative mass | Relative charge |
|---|---|---|
| proton | 1 | +1 |
| neutron | 0 | |
| electron | very small |
Complete the table to give the relative mass of a neutron and the relative charge of an electron.
An atom of oxygen has no overall electrical charge.
Explain why.
An atom of potassium can be represented as
State the meaning of the term mass number of an atom.
State the number of neutrons in this atom of potassium.
State the number of electrons in this atom of potassium.
Neon has two common isotopes, neon-20 and neon-22.
Which statement about two isotopes of the same element is correct?
A they have the same number of neutrons but different numbers of protons
B they have the same number of protons but different numbers of neutrons
C they have the same mass number but different atomic numbers
D they have different numbers of protons and different numbers of neutrons
Complete the table for these two isotopes of neon.
| Isotope | Number of protons | Number of neutrons | Number of electrons |
|---|---|---|---|
| neon-20 | 10 | 10 | |
| neon-22 | 12 |
Figure 1 shows a model of an atom of lithium. The atom contains 3 protons and 4 neutrons.
Name the two types of particle found in the part of the atom labelled A.
State the mass number of this atom of lithium.
Give the relative charge of the particle labelled B.
