Atomic Structure

What is the atomic number of an element?

• The atomic number of an element is the number of protons in the nucleus of an atom.

• The atomic number of an element is the number of electrons in the nucleus of an atom.

• The atomic number of an element is the number of neutrons in the nucleus of an atom.

• The atomic number of an element is the number of molecules in the nucleus of an atom.

How is the atomic mass of an element calculated?

• By counting the number of protons and neutrons in the nucleus

• By taking the weighted average of the masses of its isotopes.

• By measuring the volume of the atom

• By adding the number of protons and electrons in the atom

What is the atomic number of carbon?

• 6

• 3

• 8

• 12

What is the atomic mass of oxygen?

• 12.01 u

• 16.00 u

• 20.00 u

• 25.00 u

State the relationship between the number of protons and the atomic number.

• The number of protons in an atom is unrelated to the atomic number.

• The number of protons in an atom is half of the atomic number.

• The number of protons in an atom is equal to the atomic number.

• The number of protons in an atom is equal to the mass number.

Explain the concept of isotopes in relation to atomic mass.

• Isotopes are atoms of different elements with the same atomic mass.

• Isotopes are atoms of the same element with different atomic masses due to different number of protons.

• Isotopes are atoms of the same element with different atomic masses due to different number of neutrons.

• Isotopes are atoms of the same element with the same atomic mass.

What is the atomic number of an element with 6 protons?

• 6

• 2

• 10

• 4

Calculate the atomic mass of an element with 18 protons and 22 neutrons.

• 18

• 22

• 60

• 40

What is the significance of the atomic number in determining the identity of an element?

• It determines the number of protons in the nucleus of an atom.

• It determines the color of the element.

• It determines the number of electrons in the nucleus of an atom.

• It indicates the mass of the atom.

Differentiate between atomic number and atomic mass.

• Atomic number represents the number of protons in an atom, while atomic mass represents the total mass of protons, neutrons, and electrons in an atom.

• Atomic number represents the total mass of protons, neutrons, and electrons in an atom, while atomic mass represents the number of protons in an atom.

• Atomic number is the same as atomic mass.

• Atomic number represents the number of electrons in an atom, while atomic mass represents the total mass of electrons in an atom.