The nucleus of an element contains 17 protons and 18 neutrons. What is the mass number and atomic number?

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Solution

An element has 17 protons and 18 neutrons ,
1. Atomic Number of the element = $Z$
$Z$ = Number of protons
Therefore, Atomic Number $Z$ = $17$
2. Mass number of the element = $A = Z (n u m b e r o f p r o t o n s) + N (n u m b e r o f n e u t r o n s)$
$A = 17 + 18$
Hence, Mass number, $A = 35$
So, the element with atomic number = $17$ and mass number = $35$ is Chlorine = ${}_{17}^{35}{Cl}$ .

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