Question

Statement 1 : The isotope Cl-37 has 17 protons, 17 neutrons, and 17 electrons.
Statement 2 : The atomic mass of chlorine is 35.43 amu.

• A. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1
• B. Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1
• C. Statement 1 is correct but Statement 2 is not correct
• D. Statement 1 is not correct but Statement 2 is correct
• E. Both the Statement 1 and Statement 2 are not correct

Answer 1

Answer: (D)

Statement 1 is not correct but Statement 2 is correct

$Cl-37$ has $17$ protons, $17$ electrons but $20$ neutrons.

$\therefore$ Statement $1$ is incorrect.

Average atomic mass of chlorine= [Atomic mass of $Cl-35\times$ abundance+ Atomic mass of $Cl-37\times$ abundance]$/100$

$\Rightarrow \frac{34.968\times 75.60+36.956\times 24.40}{100}$

$\Rightarrow 35.453amu$

Hence, Statement $2$ is correct.