Write the number of periods the Modern Periodic Table has. State the changes in valency andmetallic character of elements as we move from left to right in a period. Also state the changes, ifany, in the valency and atomic size of elements as we move down a group.

Write the number of periods the Modern Periodic Table has. State the c

1.	Write the number of periods the Modern Periodic Table has. State the changes in valency andmetallic character of elements as we move from left to right in a period. Also state the changes, ifany, in the valency and atomic size of elements as we move down a group.
Answer» SOLUTION :The Modern PERIODIC Table has 7 periods. Valency across a period INCREASES from 1 to 4, thendecreases from 4 to zero. METALLIC character of elements across a period decreases. Valency down a GROUP remains the same. Atomic size of elements down a group increases.