Isotopes

What is the definition of isotopes?

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

• Atoms with different numbers of protons and electrons

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

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

Which of the following is a property that all isotopes of an element share?

• Same atomic number

• Same mass number

• Same number of neutrons

• Different chemical symbols

What is the main difference between stable and radioactive isotopes?

• Stable isotopes do not decay, while radioactive isotopes do

• Stable isotopes have more protons than neutrons

• Radioactive isotopes have the same number of protons and neutrons

• Stable isotopes emit radiation

Which statement best describes the mass number of an isotope?

• The sum of protons and neutrons in the nucleus

• The number of protons in the nucleus

• The number of electrons in the atom

• The sum of electrons and neutrons

Which of the following pairs are isotopes of each other?

• They have different numbers of neutrons

• They have different numbers of protons

• They have different chemical symbols

• They have different numbers of electrons

If an atom has 6 protons and 8 neutrons, what is its mass number?

• 6

• 8

• 12

• 14

How would you distinguish between two isotopes of the same element using their atomic structure?

• By comparing the number of neutrons in their nuclei

• By comparing the number of electrons in their outer shell

• By comparing their chemical symbols

• By comparing their atomic numbers

• 1 unit

• 2 units

• 24 units

• 25 units

Why do isotopes of the same element have similar chemical properties?

• Because they have the same number of electrons

• Because they have the same number of neutrons

• Because they have different atomic numbers

• Because they have different mass numbers