Question

what are the characteristics of groups and periods in modern periodic table?

Answer 1

Explanation:

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Answer 2

Answer:

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Explanation:

The horizontal rows on the periodic table are called periods. So, in these groups, the reactivity decreases as we go from top to bottom. Valence electrons, valency, atomic size, ionization energy, metallic character, electron-positivity, electron-negativity and reactivity are the characteristics of groups.