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The spectrum of Helium is expected to be similar to that of . . . . . .

An element has an atomic mass of $19$ and an atomic number of $9$. How can its ion be represented?

The atomic number of bromine is $35$ and its atomic weight is $79$. Two isotopes of bromine are present in equal amounts. Which of the following statements represents the correct number of neutrons?

In a neutral atom,which particles are equivalent in number?

Isotopes differ in

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