Question #796c2

1 Answer
Feb 4, 2016

Answer:

Explanation:

Each column (which chemists call 'group') will have elements having the same valency. They have the same number of electrons in their outermost shell.

Some examples of common elements with #n# valence electrons

#n = 1# - Li, Na, K
#n = 2# - Be, Mg, Ca
#n = 3# - B, Al
#n = 4# - C, Si
#n = 5# - N, P
#n = 6# - O, Si
#n = 7# - F, Cl, Br, I
#n = 8# - He, Ne, Ar