How may we use the Periodic Table to order atomic size?

Answer 1

#"Atomic size decreases across a Period......"#

As we face the Periodic Table, atomic size decreases across a Period from left to right, and increases down a Group, a column.

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Answer 2

Ellie Andrews

On the periodic table, atomic size generally decreases from left to right across a period and increases as you move down a group. This is because as you move across a period, more protons and electrons are added, which strengthens the attraction between the electrons and the nucleus and causes atomic size to decrease; on the other hand, as you move down a group, more electron shells are added, which increases the distance between the outer electrons and the nucleus and causes atomic sizes to increase.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.