Atomic Structure Vocabulary

This is the weighted-average mass of the mixture of an element's isotopes.

What is the positively charged center of an atom that contains protons and neutrons and is surrounded by a cloud of electrons called?

These are particles of matter that make up protons and neutrons.

This is an organized list of all known elements that are arranged according to repeated changes in properties.

This uses the symbol for an element and dots representing the number of electrons in the element's outer energy level.

What is the smallest piece of matter that still retains the property of the element?

A horizontal row in the periodic table is called a...

This represents the sum of the number of protons and neutrons in an atom's nucleus.

This represents the number of protons in an atom's nucleus.

A vertical column in the periodic table is called a...

This particle is negatively charged and it surrounds the center of an atom.

These are atoms of the same element that have different numbers of neutrons.

This particle is positively charged, composed of quarks, and is found inside the nucleus of an atom.

This particle is has a neutral charge, is composed of quarks, and is found inside the nucleus of an atom.

This is the area around the nucleus of an atom where the atom's electrons are most likely to be found.