Question

which statement is correct for the ion with the nuclear symbol * (0.5 points) it has 18 protons and 18 electrons. it has 17 neutrons and 18 electrons. it has 18 neutrons and 18 electrons. it has 17 protons and 17 electrons.

Explanation:

Step1: Identify atomic number and mass number

In the nuclear symbol $^{35}_{17}\text{Cl}^{-}$, the bottom - number (17) is the atomic number (Z) which represents the number of protons. So, the number of protons is 17.

Step2: Determine number of neutrons

The top - number (35) is the mass number (A). The mass number is the sum of protons and neutrons ($A = Z+N$). So, the number of neutrons $N=A - Z=35 - 17 = 18$.

Step3: Determine number of electrons

The ion is $\text{Cl}^{-}$, which means it has gained 1 electron. A neutral chlorine atom has the same number of electrons as protons (17). So, the $\text{Cl}^{-}$ ion has $17 + 1=18$ electrons.

Answer:

It has 18 neutrons and 18 electrons.