Introduction to Mass Number, Atomic Number, and Isotopes

The video tutorial explains the structure of an atom, focusing on protons, neutrons, and electrons. It describes how the atomic number defines an element and introduces isotopes, which have the same number of protons but different numbers of neutrons. The concept of ions is also covered, explaining how atoms become charged through the loss or gain of electrons.

What is the charge of a neutron?

• Neutral

• Negative

• Positive

• Variable

Which number in an element's symbol represents the atomic number?

• The top number

• The bottom number

• The number on the right

• The number on the left

What defines the type of element an atom is?

• Number of protons

• Number of nucleons

• Number of electrons

• Number of neutrons

What is an isotope?

• An atom with more protons than neutrons

• An atom with the same number of protons but different neutrons

• An atom with more electrons than protons

• An atom with the same number of neutrons but different protons

How does the mass number of isotopes differ?

• It is always the same

• It varies due to different numbers of neutrons

• It varies due to different numbers of protons

• It varies due to different numbers of electrons

What happens to an atom when it loses an electron?

• It becomes a positive ion

• It remains neutral

• It becomes an isotope

• It becomes a negative ion

What is the process of gaining or losing electrons called?

• Protonation

• Neutralization

• Ionization

• Isotopization