Question

Which of these pairs of elements have the same number of valence electrons?

phosphorus (P) and chlorine (Cl)

berylium (Be) and calcium (Ca)

chlorine (Cl) and helium (He)

oxygen (O) and carbon (C)
need answer fast

Answer 1

i think its oxygen and carbon due to carbon being part of it but not sure if oxygen is

Answer 2

If you look at the periodic table same number of valence electrons means that the elements are in the same group. See those columns? If two elements are in the same group, they will have the same number of valence electrons and similar chemical properties.

Group one
These elements have 1 valence electron.
H
Li
K
The next group have two valence e