2. J (4)1.25 x 10-13 1. Anion X2 co...
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2. J (4)1.25 x 10-13 1. Anion X2 contains 18 neutrons in its nucleus and 18 electrons out side of the nucleus, then mass number of main isotope of this element will be - (1) 25 46

NEET/Medical Exams
Chemistry
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( x^{-2} ) has 18 electrons ( x^{-2} operatorname{has} 2 ) eleefrons more than protens Then proton number ( =16 ) Neutron number ( =18 ) ". Mass number 2 proton t neutron [ begin{array}{l} =18+16 =34 end{array} ]
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