1.1. Figure 1.1 shows the electronic configurations of five atoms, A, B, C, D and E.

Figure 1.1

Each letter may be used once, more than once or not at all.

Give the letter of the atom, A, B, C, D or E, that is in Group III of the Periodic Table.

1.2. Give the letter of the atom, A, B, C, D or E, that  has 13 protons.

1.3. Give the letter of the atom, A, B, C, D or E, that  is a noble gas. 

1.4. Give the letter of the atom, A, B, C, D or E, that forms a stable ion with a single negative charge.