An atom has a mass number of $35$ and atomic number $17$ . The number of protons are

$17$

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$18$

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$20$

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$19$

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Solution

The correct option is A
$17$

Explanation for correct option
(A) $17$
The atomic number of an element is equal to the total number of protons present in that atom.
Given that atomic number is $17$ , so the number of protons is also $17$ .
Explanation for incorrect option
Option (B), option (C), and option (D) are not correct because the atomic number is equal to the number of protons, i.e. $17$ .
Therefore, option (A) $17$ is the correct answer.

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An atom has a mass number of 35 and atomic number 17. The number of protons are

An atom has a mass number of $35$ and atomic number $17$ . The number of protons are