Question

1. justify why atomic mass increases as atomic number increases.

hint: what does the atomic number tell you about the structure of an atom?
the atomic number is based on the number of protons in the atom. since each proton and neutron has a mass of 1 amu, adding these subatomic particles should add more mass.
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Explanation:

The atomic number represents the number of protons in an atom. As the atomic number increases, the number of protons (and usually neutrons) increases. Since protons and neutrons each have a mass of approximately 1 atomic mass unit (amu), adding more of these sub - atomic particles (protons and neutrons) leads to an increase in the total atomic mass.

Answer:

The atomic number is the number of protons. Protons and neutrons (which often increase with protons as atomic number rises) each have a mass of about 1 amu. So, more protons (and associated neutrons) mean more mass.