Question

Observe the given table and answer the following question:

| Elements | A | B | C | D | E |
| Atomic number | 11 | 4 | 2 | 7 | 19 |

Identify the two elements that belong to the same ** and the two elements that belong to the same group. Give reason for your conclusion.

Answer 1

(i) Element B and element D are in same ** because their atoms have two shells.

(ii) Element A and element E are in the same, group because their outermost shell has one electron.