Electronic configuration · इलेक्ट्रॉनिक विन्यास

Pick an element — see its shells, Bohr diagram and valency.

Electronic configuration games

Element

Shells K, L, M, N hold at most 2, 8, 18, 32 electrons (2n²).
The outermost shell holds at most 8 electrons.
Fill shells in order: K, then L, then M — that is why potassium is 2, 8, 8, 1 and calcium 2, 8, 8, 2.
Valency = outer electrons (if 1–4) or 8 minus outer electrons (if 5–8). Noble gases (He, Ne, Ar) have valency 0.

Z	Symbol	Element	K, L, M, N	Valency
1	H	Hydrogen	1	1
2	He	Helium	2	0
3	Li	Lithium	2, 1	1
4	Be	Beryllium	2, 2	2
5	B	Boron	2, 3	3
6	C	Carbon	2, 4	4
7	N	Nitrogen	2, 5	3
8	O	Oxygen	2, 6	2
9	F	Fluorine	2, 7	1
10	Ne	Neon	2, 8	0
11	Na	Sodium	2, 8, 1	1
12	Mg	Magnesium	2, 8, 2	2
13	Al	Aluminium	2, 8, 3	3
14	Si	Silicon	2, 8, 4	4
15	P	Phosphorus	2, 8, 5	3
16	S	Sulphur	2, 8, 6	2
17	Cl	Chlorine	2, 8, 7	1
18	Ar	Argon	2, 8, 8	0
19	K	Potassium	2, 8, 8, 1	1
20	Ca	Calcium	2, 8, 8, 2	2

For Class 9 (NCERT Exploration, “Journey Inside the Atom”). See the full periodic table.

A one-page chart to stick on the wall, and a worksheet to practise.

Z	Symbol	Element	K, L, M, N	Valency
1	H	Hydrogen	1	1
2	He	Helium	2	0
3	Li	Lithium	2, 1	1
4	Be	Beryllium	2, 2	2
5	B	Boron	2, 3	3
6	C	Carbon	2, 4	4
7	N	Nitrogen	2, 5	3
8	O	Oxygen	2, 6	2
9	F	Fluorine	2, 7	1
10	Ne	Neon	2, 8	0
11	Na	Sodium	2, 8, 1	1
12	Mg	Magnesium	2, 8, 2	2
13	Al	Aluminium	2, 8, 3	3
14	Si	Silicon	2, 8, 4	4
15	P	Phosphorus	2, 8, 5	3
16	S	Sulphur	2, 8, 6	2
17	Cl	Chlorine	2, 8, 7	1
18	Ar	Argon	2, 8, 8	0
19	K	Potassium	2, 8, 8, 1	1
20	Ca	Calcium	2, 8, 8, 2	2

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Name: ____________________ Class: ______ Date: __________

1. Write the configuration: N ____ Mg ____ Cl ____ K ____

2. Draw the Bohr model of sodium.

3. Find the valency: O ____ Al ____ Ar ____

4. Why is the valency of neon 0?

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