Atoms contain three different types of subatomic particles: protons, neutrons, and electrons.
Which one of these three particles has a negative charge?
Which one of these three particles has the smallest relative mass?
Use words from the box below to complete the sentences. Each word may be used once, more than once, or not at all.
| electrons | elements | neutrons | nuclei | protons |
|---|
(i) An atom is electrically neutral because it contains equal numbers of ____________ and ____________.
(ii) Isotopes are atoms of the same element with the same number of ____________ but a different number of ____________.
An atom of phosphorus can be represented by the symbol 1531P^{31}_{15}\text{P}1531P.
Use numbers to complete these statements about this atom:
(i) The atomic number of this atom is ____________.
(ii) The mass number of this atom is ____________.
(iii) The electronic configuration of this atom is ____________.
