Questions: What do the following have in common? ^17 Cl^-, ^18 Ar, and ^19 K^+ - Number of electrons They are all ions. Number of neutrons They are isotopes. Number of protons

What do the following have in common? ^17 Cl^-, ^18 Ar, and ^19 K^+
- Number of electrons
They are all ions.
Number of neutrons
They are isotopes.
Number of protons

Transcript text: Thu Oct 17 Take Quiz Quiz Instructions This exams covers material from chapters 2 and 7 of the lecture content. You have 75 minutes to complete the exam. Submitted answers cannot be changed. The exam will auto-submit upon expiration of the time limit Question 17 What do the following have in common? ${ }^{17} \mathrm{Cl}^{-},{ }^{18} \mathrm{Ar}$, and ${ }^{19} \mathrm{~K}^{+}$ - Number of electrons They are all ions. Number of neutrons They are isotopes. Number of protons Quiz saved at 10:20am

Solution

Solution Steps

Step 1: Identify the Elements and Their Atomic Numbers

The elements given are:

${ }^{17} \mathrm{Cl}^{-}$ (Chloride ion)
${ }^{18} \mathrm{Ar}$ (Argon)
${ }^{19} \mathrm{~K}^{+}$ (Potassium ion)

The atomic numbers (number of protons) for these elements are:

Chlorine ($\mathrm{Cl}$): 17
Argon ($\mathrm{Ar}$): 18
Potassium ($\mathrm{K}$): 19

Step 2: Determine the Number of Electrons

For each species, calculate the number of electrons:

${ }^{17} \mathrm{Cl}^{-}$: Chlorine normally has 17 electrons, but as a $\mathrm{Cl}^{-}$ ion, it gains one electron, totaling 18 electrons.
${ }^{18} \mathrm{Ar}$: Argon is a neutral atom with 18 electrons.
${ }^{19} \mathrm{~K}^{+}$: Potassium normally has 19 electrons, but as a $\mathrm{K}^{+}$ ion, it loses one electron, totaling 18 electrons.

Step 3: Compare the Number of Electrons

All three species have 18 electrons.