Flashcard Isotopes - Mrs. Chacon

Front

What is an isotope?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Front

How do you calculate the number of neutrons in an isotope?

Back

To find the number of neutrons, subtract the atomic number (number of protons) from the mass number of the isotope.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

How many protons does Magnesium have?

Back

12

Front

How many neutrons does Magnesium-25 have?

Back

13 (Mass number 25 - Atomic number 12 = 13 neutrons).

Front

What is the mass number of an isotope?

Back

The mass number is the total number of protons and neutrons in the nucleus of an atom.

Front

How many electrons does a neutral atom of an element have?

Back

A neutral atom has the same number of electrons as protons.

Front

What is the atomic number of Chlorine?

Back

17

Front

How many neutrons does Krypton-89 have?

Back

53 (Mass number 89 - Atomic number 36 = 53 neutrons).

Front

What is the relationship between protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons.