Question

use the chart below to identify atoms, ions, and isotopes.
which element is an ion with a +1 charge?
which element is an ion with a -2 charge?
which element is a neutral atom.
which element is an ion with a -1 charge?
lithium fluorine potassium sulfur none of these

Explanation:

Sub-question 1 (ion with +1 charge):

Step1: Charge = protons - electrons

For Lithium: $3 - 2 = +1$

Sub-question 2 (ion with -2 charge):

Step1: Charge = protons - electrons

For Sulfur: $16 - 18 = -2$

Sub-question 3 (neutral atom):

Step1: Neutral when protons = electrons

For Potassium: $19 = 19$

Sub-question 4 (ion with -1 charge):

Step1: Charge = protons - electrons

For Fluorine: $9 - 10 = -1$

Answer:

Which element is an ion with a +1 charge? Lithium
Which element is an ion with a -2 charge? Sulfur
Which element is a neutral atom? Potassium
Which element is an ion with a -1 charge? Fluorine