Question

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write down the electronic configuration and valency of elements up to ca ?​

Answer 1

Answer:

electronic configuration of calcium

k=2 , L=8 , M = 8 , N = 2

•valency 2

Answer 2

Answer:

1. Valency is the combining capacity of an element.

✓Atomic or Proton number is the number of protons found in the nucleus of every atom of that element.

✓ Isotopy is define as the one of two or more atom having same atomic number but different mass number.Two elements that exhibit isotopy are chlorine and carbon

2. Sodium=1s^2 2s^2 2ps^6 3s^1.

Aluminum ion=1s^2 2s^2 2p^6.

Chlorine ion=1s^2 2s^2 2p^6 3s^2 3p^5.

Sulphur=1s^2 2s^2 2p^6 3s^2 3p^4 .

3a.sodium=11

b. Neon=10

c. Mass number=37

Number of neutrons=20

Number of electrons=18.

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