Quiz Atomic Structure

What does the atomic number of an element represent?

• The number of protons in the nucleus

• The number of neutrons in the nucleus

• The total number of protons and neutrons in the nucleus

• The total number of protons and electrons in an atom

What are isotopes of an element?

• Atoms with the same number of protons but different numbers of electrons

• Atoms with the same number of protons but different numbers of neutrons

• Atoms with the same number of neutrons but different numbers of protons

• Atoms with the same atomic mass but different atomic numbers

How is the atomic mass of an element calculated?

• By adding the number of protons and neutrons

• By subtracting the number of neutrons from the number of protons

• By averaging the mass of all isotopes of the element

• By multiplying the number of protons by the number of neutrons

Which of the following are subatomic particles?

• Protons, Neutrons, Electrons

• Atoms, Ions, Molecules

• Quarks, Bosons, Leptons

• A) and C) are correct

What is the weighted average atomic mass of an element?

• The average mass of the element's isotopes, weighted by their natural abundance

• The sum of the masses of the element's isotopes

• The mass of the most abundant isotope of the element

• The average mass of the element's isotopes, divided by the number of isotopes

How do you calculate the weighted average atomic mass of an element with two isotopes?

• Multiply the mass of each isotope by its natural abundance, then add the results

• Add the masses of the isotopes, then divide by the total number of isotopes

• Multiply the mass of each isotope by its atomic number, then add the results

• Add the masses of the isotopes, then multiply by the most abundant isotope's abundance

What is the atomic number of an element with 17 protons?

• 17

• 34

• 8

• 35

If an isotope of carbon has 6 protons and 8 neutrons, what is its mass number?

• 6

• 8

• 14

• 12

What is the mass number of an atom that has 20 protons, 20 neutrons, and 20 electrons?

• 20

• 40

• 60

• 80

How many neutrons are in an isotope of uranium with a mass number of 238 and an atomic number of 92?

• 92

• 146

• 238

• 346

Tags

NGSS.HS-PS1-8