Question

what is the number of valance electrons that hydrogen and helium have?

Answer 1

put together or seperate?

Answer 2

seperate

Answer 3

hydrogen has 1 and helium has 2

Answer 4

how can you tell

Answer 5

because of where they are on the periodic table, a valence electron is the electrons in the outter most level, because hydrogen only has one electron it has to have a valence elcetron of 1 because helium only has 2 valence electrons it has three, lithium would have 1 because the first enegery level is full it all depends on where it falls on the periodic table

Answer 6

so would beryllium be 2?

Answer 7

yes

Answer 8

i thought u said 1?

Answer 9

beryllium is in group 2 so it would have 2 valence elctrons hydrogen, lithium sodium and all the ones going down in that group have one

Answer 10

okay so then beryllium and magnesium have 2
boron and aluminum have three
carbon and silicon have four
notrogen and phosphorus have five
oxygen and sulfur have 6
Fluorine and cholorine 7
Helium has 2
neon and argon all have 8
Is that right?