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The video provides a brief introduction to the concept of mass number, which is a fundamental aspect of atomic structure in chemistry. It explains the significance of mass number in identifying isotopes and understanding atomic mass.

What is the mass number primarily concerned with?

• The atomic weight of an element

• The number of electrons in an atom

• The total number of protons and neutrons in an atom

• The number of protons in an atom

How is the mass number of an atom calculated?

• By adding the number of protons and neutrons

• By multiplying the number of protons and neutrons

• By subtracting the number of neutrons from protons

• By adding the number of protons and electrons

Why is the mass number important in scientific studies?

• It helps in identifying the chemical properties of an element

• It determines the color of an element

• It is used to calculate the speed of light

• It is crucial for understanding the stability of an atom

Which of the following is NOT a component of the mass number?

• Electrons

• Protons

• Nucleons

• Neutrons

In what way does the mass number differ from the atomic number?

• Mass number includes neutrons, atomic number does not

• Mass number is always smaller than atomic number

• Mass number is a fraction, atomic number is an integer

• Mass number includes electrons, atomic number does not