look at a "periodik tabel av elements" . . . metal: lithium, Berry, sodium, magnesium, aluminum...5 line 4:K thru ga=12 . . . line 5:Rb thru Sn=14 . . . line 6:cs thru bi=16 . . . line 7:3......50 metals #### semimetal...Boron, Si, Ge, As, Sb, Te, At...8 . . . nonmetal: hydrogen, Helium, Karbon, nitrogen... 2+5+4+3+2+1...17 all others=rare erths