Question

13 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 proton number

The sub - script in the nuclear symbol $_{17}^{35}Cl^-$ represents the atomic number (number of protons). So, the number of protons is 17.

Step2: Determine electron number

The ion is $Cl^-$, which means it has gained one electron. A neutral chlorine atom has 17 electrons, so the $Cl^-$ ion has 17 + 1=18 electrons.

Step3: Calculate neutron number

The mass number (sup - script) is 35. The number of neutrons $n$ is calculated by $n = mass\ number - atomic\ number$. So, $n=35 - 17 = 18$ neutrons.

Answer:

It has 18 neutrons and 18 electrons.