Table 1 shows some information about three subatomic particles.

Complete Table 1 by giving the missing values for (i), (ii), and (iii).

Table 2 shows the number of protons, neutrons, and electrons in particles A, B, C, D, and E.

Use Table 2 to answer these questions.

Each particle, A, B, C, D, and E, may be used once, more than once, or not at all.

(i) State which particle has the highest mass number.

(ii) State which particle has seven electrons in its outer shell.

(iii) State which particle is a negative ion.

(iv) State which particle is an atom of an element in Group 1 (alkali metals) of the Periodic Table.

Which of these statements is correct for two different isotopes of oxygen, oxygen-16 and oxygen-18?

• A they have the same number of electrons
• B they have different chemical properties
• C they have the same number of neutrons
• D they have a different number of protons