Question

An atom of element has 3 electrons in third shell. It's atomic number will be-
a. 3
b. 13
c. 11
d. 5​

Answer 1

13 is the answer.

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Answer 2

An atom of element has 3 electron in third shell. It's atomic number will be 13.

Explanation :

Because first shell K is filled with 2 electrons and second shell L is filled with 8 electrons and the third shell is filled with 3 electrons. So,the atomic number will be 13.

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Periodic table of 20 elements :-

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