You can easily find hundreds on the internet.
Nitrogen has five valence electrons
Answer:
On the placement of hydrogen and helium in the periodic system
H1=1
He2=2
I don't know because your question is very unclear
Answer:
An example of multiple alleles is the ABO blood-type system in humans. In this case, the IA and IB alleles are codominant with each other and are both dominant over the i allele. Although there are three alleles present in a population, each individual only gets two of the alleles from their parents.