There are generally three kinds of mutation.
1. Substitution
2. Deletion
3. Insertion
A substitution is change one nucleotide for another
A deletion is removing a nucleotide
An addition Is inserting a nucleotide
A point mutation can either be silent, missense, or nonsense. In silent mutations, the codon is changed but the encoded amino acid is not changed. This is because different codons code for the same amino acids. Missense mutations will have a significant effect on the protein because the amino acid is replaced by another. A nonsense mutation will result to a fragmented protein because the mutation will lead to the formation of a stop codon which will stop the translation process.
I dont think there is anything similar between the two
Atomic number is equal to the number of protons in an atom, elements’ identity are related to the number of their protons. So, its 18