02b - Atomic Number and Atomic Mass

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 do you calculate the number of neutrons in an atom?

Back

Number of neutrons = Mass number - Atomic number.

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

What charge does the nucleus of an atom have?

Back

The nucleus is positively charged due to the presence of protons.

Front

What charge does the electron cloud have?

Back

The electron cloud is negatively charged due to the presence of electrons.

Front

How many electrons does a neutral atom have compared to protons?

Back

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

Front

What is the relationship between atomic number and element identity?

Back

The atomic number uniquely identifies an element; no two elements have the same atomic number.

Front

What is the significance of the mass number in isotopes?

Back

Isotopes are variants of an element that have the same atomic number but different mass numbers due to differing numbers of neutrons.

Front

What is the electron configuration of Neon (Ne)?

Back

Neon has an electron configuration of 1s² 2s² 2p⁶, with a total of 10 electrons.

Front

Define isotopes.

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.