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Question
State the number of elements in Period 1 of the Periodic Table.
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Solution
Period 1 is the shortest period has 2 elements
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Consider the following elements:
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| Li | Be | B | C | N | O | F | |
| Na | Mg | Al | Si | P | S | Cl |
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(ii) What happens to the atomic size?
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______ forms the basis of the modern periodic table.
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| Mg, | Ca, | K, | Ge, | Ga |
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| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
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