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NEET levelSingle correct optionDifficulty 1 of 3as009

A species has 17 protons, 18 neutrons and 18 electrons. It is represented as

A $X_{17}^{35} X_{217}^{235} Cl X^{-}$
B $X_{17}^{35} X_{217}^{235} Cl X^{+}$
C $X_{18}^{36} X_{218}^{236} Ar$
D $X_{17}^{36} X_{217}^{236} Cl X^{-}$

Answer: A

Atomic number = 17 (chlorine), mass number = 17 + 18 = 35, and 18 electrons means one extra electron, so the charge is -1. The species is

X_{17}^{35} X_{217}^{235} Cl X^{-}

.

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