What Trend In Atomic Radius Occurs Down A Group On The Periodic Table What Causes This Trend?

What trend in atomic radius occurs down a group on the periodic table what causes this trend?

 

Answer:

WHY? - The number of energy levels increases as you move down a group as the number of electrons increases. Each subsequent energy level is further from the nucleus than the last. Therefore, the atomic radius increases as the group and energy levels increase. 2) As you move across a period, atomic radius decreases.

WHAT CAUSES THIS TREND? Ionization energy tends to increase across a period because the nuclear pull is increasing while shielding is not changing because electrons are in the same energy level. Not only that as we move across a period elements are closer to a full octet.

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