Answer:
Frequency and period are distinctly different, yet related, quantities. Frequency refers to how often something happens. Period refers to the time it takes something to happen. Frequency is a rate quantity.
Step-by-step explanation:
down the group atomic raddi increases due to increase of energy level but across the period the atomic radii decreases since electrons in the outermost energy level are pulled closer to the nucleus decreasing the size of atom across the period
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