What is the pattern that the atomic number and mass follow in the periodic table?

Answer 1

Generally, as the atomic number increases, the mass number increases. This is due to myriad factors.

A few are the magnitude of subatomic particles within the nucleus. Here's a graphical representation,

Generally the trend holds, however for a few atoms (e.g. #Ar#), heavier isotopes are more common. Hence, we have those little anomalies within the line.

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Answer 2

Avery Adams

In general, the atomic mass increases from top to bottom and from left to right within each group or column, but the atomic number increases from left to right throughout each period.

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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.