Which number determines how the periodic table is arranged?

Answer 1

Atomic number.

Each element on the Periodic Table has their own configuration of electrons. In order to have a neutral charge, there is an equal number of protons to electrons.

Thus, the atomic number (number of protons) order the elements. There is also consideration of each element's properties, but all that goes hand-in-hand with its atomic number.

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Answer 2

Natalie Anton

The order of the elements in the periodic table is determined by their atomic number.

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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.