Question

classification of elements and their periodic table in physics lesson mind map
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Answer 1

Modern Periodic Table has periods (rows) and groups (columns). There are 18 groups and number of periods can be 1 to 7 in a group.

⋅ A period shows the energy level or orbit number.

⋅ First period has only two elements. This is the smallest period.

⋅ Second and third periods have 8 elements each. These are called small periods.

⋅ Fourth and fifth periods have 18 elements each. These are called long periods.

⋅ Sixth and seventh periods have 32 elements each. These are called very long periods.

⋅ Group number of an element is same as the number of valence electrons in that element.

⋅ Metals are on the left side, while non-metals are on the right side of table.

⋅ Noble elements are in the last group of periodic table.

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