what is the electronic configeration and valency of 1st 20 elements

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Solution

Elements
Electronic configuration
K L M N
Valency
Hydrogen (1) 1 1
Helium (2) 2 0
Lithium (3) 2 1 1
Boron (4) 2 2 2
Beryllium (5) 2 3 3
Carbon (6) 2 4 4
Nitrogen (7) 2 5 3,5
Oxygen (8) 2 6 2
Fluorine (9) 2 7 1
Neon (10) 2 8 0
Sodium (11) 2 8 1 1
Magnesium (12) 2 8 2 2
Aluminium (13) 2 8 3 3
Silicon (14) 2 8 4 4
Phosphorus (15) 2 8 5 3,5
Sulphur (16) 2 8 6 2
Chlorine (17) 2 8 7 1
Argon (18) 2 8 8 0
Potassium (19) 2 8 8 1 1
Calcium (20) 2 8 8 2 2

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Elements	Electronic configuration K L M N	Valency
Hydrogen (1)	1	1
Helium (2)	2	0
Lithium (3)	2 1	1
Boron (4)	2 2	2
Beryllium (5)	2 3	3
Carbon (6)	2 4	4
Nitrogen (7)	2 5	3,5
Oxygen (8)	2 6	2
Fluorine (9)	2 7	1
Neon (10)	2 8	0
Sodium (11)	2 8 1	1
Magnesium (12)	2 8 2	2
Aluminium (13)	2 8 3	3
Silicon (14)	2 8 4	4
Phosphorus (15)	2 8 5	3,5
Sulphur (16)	2 8 6	2
Chlorine (17)	2 8 7	1
Argon (18)	2 8 8	0
Potassium (19)	2 8 8 1	1
Calcium (20)	2 8 8 2	2