Answer:
22:
Formular:
[tex]atomic \: mass = \frac{ \sum(isotopic \: mass \times \%abundance)}{100} \\ [/tex]
substitute:
[tex]atomic \: mass = \frac{(23.985 \times 78.70) + (24.986 \times 10.13) + (25.983 \times 11.17)}{100} \\ \\ = \frac{(1887.620) + (253.108) + (290.230)}{100} \\ \\ = \frac{2430.958}{100} \\ \\ { \boxed{ \boxed{average \: atomic \: mass = 24.3 \: amu}}}[/tex]
23:
Same element is represented by same number of protons.
Answer:
6 protons. 6 protons
7 neutrons. 8 neutrons
6 electrons. 6 electrons
Note: Atoms with same proton number but different mass number are called isotopes
