Questions: Part D Calcium's atomic number is 20, It forms ions with 18 electrons. What is the electrical charge of a calcium ion? +1 +2 -1 -2
Transcript text: Part D
Calcium's atomic number is 20, It forms ions with 18 electrons. What is the electrical charge of a calcium ion?
$+1$
$+2$
$-1$
$-2$
Solution
Solution Steps
Step 1: Determine the number of protons
Calcium's atomic number is 20, which means it has 20 protons.
Step 2: Determine the number of electrons in the ion
The calcium ion has 18 electrons.
Step 3: Calculate the charge
The charge of the ion is determined by the difference between the number of protons and electrons. Since there are 20 protons and 18 electrons, the ion has \( 20 - 18 = 2 \) more protons than electrons, resulting in a \( +2 \) charge.