Basic Chemistry Concepts

Front

The number of positive charges or protons in the nucleus of an atom of a given element, and therefore also the number of electrons normally surrounding the nucleus.

Back

Atomic number

Front

In the Periodic Table, a vertical column that contains elements having the same number of valence electrons in the outermost shell of their atoms.

Back

Groups

Front

Any of a number of chemical elements, such as iron or copper, that are often lustrous ductile solids and are good conductors of heat and electricity.

Back

Metals

Front

Dull, not malleable or ductile, poor conductors, most are solid or gaseous at room temperature.

Back

Non-metals

Front

The horizontal (left to right) rows on the periodic table.

Back

Periods

Front

A table illustrating the periodic system, in which the chemical elements, arranged according to their atomic numbers, are shown in related groups.

Back

Periodic Table

Front

The relative capacity of an atom to undergo a chemical reaction with another atom.

Back

Reactivity

Front

A stable, positively charged elementary particle, found in atomic nuclei in numbers equal to the atomic number of the element.

Back

Proton

Front

An electrically neutral subatomic particle in the nucleus of all atoms, except hydrogen.

Back

Neutron

Front

A stable elementary particle present in all atoms, orbiting the nucleus in numbers equal to the atomic number of the element in the neutral atom, has a negative charge.

Back

Electron