What is the atomic number of an isotope?

• The number of protons plus neutrons

• The number of protons

• The number of neutrons

• The number of electrons

How do isotopes of the same element differ?

• Different number of protons

• Different number of electrons

• Different number of neutrons

• Different atomic numbers

If Carbon-14 has 6 protons, how many neutrons does it have?

• 6

• 7

• 8

• 14

Which of the following is true about isotopes?

• They have different atomic numbers.

• They have the same number of neutrons.

• They have the same number of protons.

• They are different elements.

How can you find the number of neutrons in an isotope?

• Subtract the atomic number from the mass number.

• Add the atomic number to the mass number.

• Multiply the atomic number by 2.

• Divide the mass number by the atomic number.

What is the mass number of an isotope with 20 protons and 22 neutrons?

• 20

• 22

• 40

• 42

If an isotope has an atomic number of 15 and a mass number of 31, how many neutrons does it have?

• 15

• 16

• 31

• 46

Which of the following isotopes has the most neutrons?

• Oxygen-16

• Oxygen-17

• Oxygen-18

• They all have the same number of neutrons.

If two isotopes have the same mass number but different atomic numbers, what can you infer about them?

• They are isotopes of the same element.

• They have the same number of neutrons.

• They are not isotopes but different elements.

• They have the same number of protons.

An isotope of nitrogen has 7 protons and 8 neutrons. What is its mass number?

• 7

• 8

• 15

• 22