The table below gives the numbers of protons, electrons, and neutrons in four atoms.
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39
Atom
Number of protons Number of electrons Number of neutrons
3952
12
40
40
5 0
39
39
54
4404051
20
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Based on the information that is given, which atom in the table has the highest mass?

It’s hard to understand your “table” in how it appears on here, but you just add them. Electrons are so small that they don’t really impact the mass.

Explanation:

the answer for sodium is 0.186

the answer for rubidium is 0.251

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year