Atomic Structure

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 an element with atomic number 9 have?

Back

An element with atomic number 9 has 9 protons.

Front

What are protons?

Back

Protons are subatomic particles with a positive charge found in the nucleus of an atom.

Front

What is the electron configuration of a lithium atom?

Back

The electron configuration of a lithium atom is 2,1.

Front

What does the electron configuration 2,8,3 indicate about an element?

Back

The electron configuration 2,8,3 indicates that the element has 3 valence electrons and belongs to Group 13.

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 are neutrons?

Back

Neutrons are subatomic particles with no charge that are found in the nucleus of an atom.

Front

What is the difference between atomic mass and atomic number?

Back

Atomic mass is the weighted average mass of an element's isotopes, while atomic number is the number of protons in the nucleus.

Front

What is an isotope?

Back

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

Front

What is the chemical symbol for lithium?

Back

The chemical symbol for lithium is Li.