Multiple Choice Question Answer XXI — task. Science CBSE, Class 9.

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1. How many moles of electrons weigh one kilogram?

2. Which has the maximum number of atoms?

Answer variants:

$1 / 9.108$ ×

$10^3{^1}$

23 g He

23 g Ne

$6.023$ ×

$10^2{^3}$

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