Rank the elements in the table below in order from least to greatest number of atoms.

Question

Element: Mass:

He 12.9

Be 15.9

Mg 36.4

Ca 87.2

The atoms that I calculated:

1.94x10^24 He

1.06x10^24 Be

9.03x10^23 Mg

1.31x10^24 Ca

But I am unsure on how to rank them least to greatest.

Answer 1

The least would be 9.03x10^23 Mg and the greatest would be 1.94x10^24 He. Do you see why that is so?

If you express 9.03x10^23 as 0.903x10^24 you can see how that is the lowest value, right?

Then you have all in terms of 10^24 and next in line would be 1.06, then 1.31 and finally 1.94