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Modern Periodic Table

Which of the ...

Question

Which of the following ions has the same number of electrons as a krypton atom with atomic number $36$ ?

Chlorine

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Sodium

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Rubidium

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Xenon

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Solution

The correct option is A Rubidium
Krypton's atomic number is $36$ , therefore it has $36$ electrons in it. Among given options Rubidium ion $({R b}^{+})$ has $37 - 1 = 36$ electrons. Thus the correct answer is option C Rubidium. This is because, Rubidium ion exists in the +1 state i.e it loses one of the electron.

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