Understanding Ions and Atoms

The video tutorial explains the concept of ions, using examples of aluminum and sulfur ions to illustrate how ions differ from atoms in terms of electrical charge. It covers the calculation of protons and electrons in ions, the writing of atomic symbols, and provides practice problems to reinforce understanding.

What is the atomic number of aluminum?

• 13

• 27

• 10

• 3

Why do ions have a net charge?

• Because they have equal protons and electrons

• Because they have more protons than electrons

• Because they have more electrons than protons

• Because the number of protons and electrons are different

What is a positively charged ion called?

• Proton

• Cation

• Electron

• Anion

How many electrons does a sulfur ion with a charge of -2 have?

• 18

• 16

• 20

• 14

What is the atomic number of phosphorus?

• 18

• 31

• 16

• 15

How do you calculate the mass number of an element?

• Protons plus electrons

• Protons minus neutrons

• Protons plus neutrons

• Electrons minus protons

What is the net charge of an ion with 29 protons and 27 electrons?

• +2

• -2

• -3

• +3

How many electrons does an ion with 32 protons and a charge of +4 have?

• 36

• 32

• 30

• 28

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

• Neutral

• Negative

• Positive

• Zero

What element has an atomic number of 26?

• S

• P

• Al

• Fe