Question

1. how are isotopes of the same element alike? select all that apply.

they have the same mass number.
they have the same number of protons.
they have the same atomic number.
they have the same number of neutrons.

Explanation:

Isotopes are atoms of the same element. The atomic number is equal to the number of protons. Since they are the same element, they have the same atomic number and thus the same number of protons. The mass number is the sum of protons and neutrons. Isotopes differ in the number of neutrons, so they have different mass numbers.

Answer:

• They have the same number of protons.
• They have the same atomic number.