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ycow [4]
3 years ago
8

Plz help me . you’re the best!! i’m really confused.

Chemistry
1 answer:
ludmilkaskok [199]3 years ago
3 0

Answer:

3rd one the mass of the protons and neutrons together. The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom. Consider the table below, which shows data from the first six elements of the periodic table. Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus

Explanation:

hope this helps have a good night/day :) ❤

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