Practice: Atoms and Elements

Front

What is an atomic number?

Back

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

Front

What is a mass number?

Back

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

Front

How are elements arranged in the Periodic Table?

Back

Elements are arranged in order of increasing atomic number.

Front

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

Back

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

Front

What is the significance of the Periodic Table?

Back

The Periodic Table organizes elements based on their properties and atomic structure, helping predict their behavior.

Front

What are metals, and where are they located on the Periodic Table?

Back

Metals are typically found on the left side and in the center of the Periodic Table; they are good conductors of heat and electricity.

Front

What are non-metals, and where are they located on the Periodic Table?

Back

Non-metals are found on the right side of the Periodic Table; they are poor conductors and have varied physical properties.

Front

What are metalloids?

Back

Metalloids are elements that have properties of both metals and non-metals, and they are found along the zig-zag line on the Periodic Table.

Front

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

Back

To find the number of neutrons, subtract the atomic number from the mass number (Neutrons = Mass Number - Atomic Number).

Front

What is the atomic mass of an element?

Back

The atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).