Isotopes/structure of an atom

Front

What is an isotope?

Back

Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses.

Front

How do you calculate the atomic mass of an element with multiple isotopes?

Back

The atomic mass is calculated by taking the weighted average of the masses of its isotopes, based on their relative abundances.

Front

What is the atomic mass of an element with two isotopes: 10.01 amu (19.8% abundance) and 10.99 amu (80.2% abundance)?

Back

10.8 amu.

Front

What do isotopes of an element have in common?

Back

Isotopes of an element have the same number of protons and electrons.

Front

What differs between isotopes of the same element?

Back

Isotopes differ in the number of neutrons.

Front

What is the mass number of an atom?

Back

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

Front

How many protons are in neon-22?

Back

10 protons.

Front

What is the relationship between protons and atomic number?

Back

The atomic number of an element is equal to the number of protons in its nucleus.

Front

If an element has 13 neutrons and a mass number of 28, how many protons does it have?

Back

15 protons (28 - 13 = 15).

Front

What is the charge of a neutral atom?

Back

A neutral atom has no overall charge, meaning the number of protons equals the number of electrons.