Atomic Structure Review

The smallest unit of an element that keeps the element’s chemical properties.

Positively charged particles found in the nucleus of an atom.

A substance that cannot be broken down into simpler substances by chemical means.

Particles with a neutral charge found in the nucleus of an atom.

The dense center of an atom containing protons and neutrons.

A negatively charged subatomic particle located around the nucleus of an atom.

The electrons filling the outermost shell; react with other atoms.

A group of atoms held together by chemical forces.

Areas around the nucleus filled with electrons. 

A substance formed from two or more atoms chemically united in fixed proportions.

All known elements arranged in order by atomic number.

Vertical columns of elements that have the same amount of valence electrons.

Elements that are malleable, ductile, and good conductors; typically shiny.

Horizontal rows of elements that have the same number of electron shells. 

The average number of protons and neutrons in one atom of an element.

Elements that are brittle, poor conductors, and have low melting and boiling points.

An element that has properties that fall between metals and nonmetals.

Elements in group 18 that have very low reactivity.

1

2

3

4

20

3

2

4

Metals

Metalloids

Non-Metals