Atoms and the Periodic Table

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). It is usually found at the bottom of each square on the periodic table.

Front

What two subatomic particles make up the nucleus of an atom?

Back

Protons and Neutrons.

Front

In a model of an atom, where are the electrons located?

Back

Electrons are found in energy levels or shells surrounding the nucleus.

Front

What is the electrical charge of protons?

Back

Protons have a positive (+) electrical charge.

Front

What is the element symbol for Sodium?

Back

Na.

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

What is the charge of neutrons?

Back

Neutrons have no charge (they are neutral).

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of elements, organized by increasing atomic number, which shows the relationships between them.

Front

What are isotopes?

Back

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

Front

What does the chemical symbol represent?

Back

The chemical symbol is a one or two-letter abbreviation used to represent an element.