Atomic number, Atomic mass, Mass number: What's the difference?

The video tutorial explains the differences between atomic number, atomic mass, and mass number. It begins with a basic understanding of atoms and their components: protons, neutrons, and electrons. The atomic number is defined as the number of protons in an element's nucleus, while the mass number is the sum of protons and neutrons. Atomic mass is the average mass of an element's atoms, considering isotopes. The tutorial also covers isotopes, which are variations of elements with the same atomic number but different mass numbers. Carbon is used as an example to illustrate these concepts.

What are the three main particles that make up an atom?

• Protons, Electrons, and Photons

• Electrons, Neutrons, and Photons

• Protons, Neutrons, and Photons

• Protons, Neutrons, and Electrons

What does the atomic number of an element represent?

• The number of neutrons in the nucleus

• The number of electrons in the outer shell

• The number of protons in the nucleus

• The total number of protons and neutrons

How is the mass number of an atom determined?

• By multiplying the number of protons and neutrons

• By adding the number of protons and electrons

• By adding the number of protons and neutrons

• By subtracting the number of electrons from protons

What is the atomic mass of an element?

• The mass of the lightest isotope

• The mass of the heaviest isotope

• The average mass of an element's isotopes

• The total number of protons and neutrons

Which of the following is true about isotopes?

• They have different numbers of protons

• They have the same mass number

• They have different atomic numbers

• They have the same atomic number but different mass numbers

How many neutrons does Carbon-14 have?

• 14

• 6

• 7

• 8

What is the mass number of Carbon-13?

• 14

• 6

• 12

• 13