Understanding Ion Charges

The video tutorial explains how to determine the charge of ions by comparing the number of protons and electrons. It starts with a calcium ion example, showing that a calcium ion with 18 electrons has a 2+ charge due to having 20 protons. The tutorial then provides another example with a nitrogen ion, which has 7 protons and 10 electrons, resulting in a 3- charge. The video emphasizes using the periodic table to identify elements based on their proton count.

What is the charge of a calcium ion with 18 electrons?

• 2+

• 1+

• 0

• 2-

How many protons does calcium have?

• 24

• 22

• 20

• 18

What is the atomic number of calcium?

• 24

• 22

• 20

• 18

What happens to a neutral calcium atom when it loses two electrons?

• It remains unchanged

• It becomes a 2- ion

• It becomes a 2+ ion

• It becomes a neutral atom

What is the net charge of an atom with equal protons and electrons?

• Positive

• Negative

• Undefined

• Neutral

What is the charge of an ion with 7 protons and 10 electrons?

• 0

• 3+

• 1-

• 3-

How many neutrons are present in the nitrogen ion example?

• 10

• 9

• 8

• 7

What element is defined by having 7 protons?

• Oxygen

• Nitrogen

• Carbon

• Hydrogen

How is a 3- charge denoted for an ion?

• 1-

• 3-

• 0

• 3+

What is the charge of an ion with more electrons than protons?

• Positive

• Negative

• Undefined

• Neutral