for each group, write the # of valence electrons...
for each group, write the # of valence electrons...
Answer
Explanation:
Step1: Recall valence - electron rules
Elements in group 1 have 1 valence electron, group 2 have 2 valence electrons. For groups 13 - 18, the number of valence electrons is the group number minus 10.
Step2: Determine for each group
Group 1 (H, Li, Na, K, Rb, Cs, Fr): 1 valence electron. Group 2 (Be, Mg, Ca, Sr, Ba, Ra): 2 valence electrons. Group 13 (B, Al, Ga, In, Tl): 3 valence electrons. Group 14 (C, Si, Ge, Sn, Pb): 4 valence electrons. Group 15 (N, P, As, Sb, Bi): 5 valence electrons. Group 16 (O, S, Se, Te, Po): 6 valence electrons. Group 17 (F, Cl, Br, I, At): 7 valence electrons. Group 18 (He, Ne, Ar, Kr, Xe, Rn): 8 valence electrons (except He which has 2).
Answer:
Group 1: 1; Group 2: 2; Group 13: 3; Group 14: 4; Group 15: 5; Group 16: 6; Group 17: 7; Group 18: 8 (2 for He)