Valence configuration

Look again carefully at the group valence configurations. They are really easy if you understand the filling of the subshells and know your periodic table.

s¹	s²	s²d¹	s²d²	s²d³	s¹d⁵	s²d⁵	s²d⁶	s²d⁷	s²d⁸	s¹d¹⁰	s²d¹⁰	s²p¹	s²p²	s²p³	s¹p⁵	s²p⁵	s²p⁶
							1 H
3Li	4Be											5B	6C	7N	8O	9F	10Ne
11Na	12Mg											13Al	14Si	15P	16S	17Cl	18Ar
19K	20Ca	21Sc	22Ti	23V	24Cr	25Mn	26Fe	27Co	28Ni	29Cu	30Zn	31Ga	32Ge	33As	34Se	35Br	36Kr
37Rb	38Sr	39Y	40Zr	41Nb	42Mo	43Tc	44Ru	45Rh	46Pd	47Ag	48Cd	49In	50Sn	51Sb	52Te	53I	54Xe
55Cs	56Ba	71Lu	72Hf	73Ta	74W	75Re	76Os	77Ir	78Pt	79Au	80Hg	81Tl	82Pb	83Bi	84Po	85At	86Rn
s-block ns^x x 1, 2		d-block ns²(n-1)d^x (x is 1- 10)										p-block ns² np^x (x is 1-6)

For s and p-block elements:

The shell number (given by n) in for the valence electrons is the period number.

For d block elements:

n for s electrons equals the period number n for d-electrons equals (period number -1).