Level 4 Vocabulary

Front

A horizontal row of elements in the periodic table.

Back

Period

Front

The number of protons in the nucleus of an atom.

Back

Atomic number

Front

A class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity.

Back

Metals

Front

The central core of an atom, containing protons and neutrons.

Back

Nucleus

Front

What is the mass number of Aluminium-28?

Back

28

Front

The vertical columns in the periodic table that group elements with similar properties.

Back

Group

Front

The average mass of an element's isotopes, weighted by their natural abundance.

Back

Atomic mass

Front

Elements that are typically poor conductors of heat and electricity, and are found on the right side of the periodic table.

Back

Nonmetals

Front

Elements that have properties of both metals and nonmetals, often found along the zig-zag line on the periodic table.

Back

Metalloids

Front

The region around the nucleus where electrons are likely to be found.

Back

Electron cloud