What is an isotope?(3 points)

Responses

Two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.
Two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.

The geologic age of a fossil, or a geologic event or structure expressed in units of time, usually years. Also known as actual age.
The geologic age of a fossil, or a geologic event or structure expressed in units of time, usually years. Also known as actual age.

The time required for half of the atoms of a radioactive substance to break down into other elements.

1 answer

The correct response for the definition of an isotope is:

Two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.

This distinction allows isotopes of the same element to have different atomic masses and can lead to different properties, especially in the context of radioactive decay.