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The atomic mass of an element is 19. The second shell of its atom contain 7 electrons. The number of protons in its nucleus is :

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The atomic mass of an element is 19. The second shell of its atom contain 7 electrons. The number of protons in its nucleus is : 

(1) 9 

(2) 10 

(3) 7 

(4) 12

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1 Answer

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Correct option (1) 9

Explanation:

Element (19/9 X)

K L

X = 2 , 7

The sum of the number of electrons in shell K & L of element X is 9

Therefore, number of protons in element X is 9.

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