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Q.

The atomic number of an element X is 19. The number of electron in its ions $X^{+}$ will be:

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a

18

b

19

c

20

d

21

answer is A.

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Detailed Solution

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The atomic number of an element X is 19. The number of electron in its ions

X^{+}

will be 18.
Atomic number is the number of protons present in the nucleus of an atom and the number of electrons and protons present in an atom is equal. X can gain or lose electrons to form an ion. X gains an electron to attain a negative charge and form X+. The total number of electrons in X atom are now
⇒ 19 – 1
⇒ 18

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The atomic number of an element X is 19. The number of electron in its ions X+will be: