Structure of Matter

A region around the nucleus of an atom where electrons are likely to be found is the

• molecules

• nucleus

• electron clouds

• proton cloud

Groups of two or more atoms held together by chemical bonds are

• atoms

• molecules

• electrons

• protons

Positively charged particles are called-

• protons

• electrons

• nuetrons

• electron clouds

The relative sizes of two or more values—2:1 (there are two oranges for every apple) is a

• lattice structure

• ratio

• equation

• exponent

The average mass of all protons and neutrons in an atom is called

• atomic number

• atomic mass

• atomic ratio

• atomic protons

An orderly, three-dimensional pattern of ions or atoms in a solid is called-

• crystal

• proportion

• molecule

• pattern

In some types of substances, the molecules or atoms are arranged in neat, ordered rows called-

• molecules

• protons

• lattice

• atoms

The smallest particle of an element that cannot be broken down without changing the properties of the element is called

• an atom

• a proton

• an element

• a compound

When two or more different atoms chemically combine they make a(n)-

• element

• compound

• atom

• proton

The particles of the nucleus that have no charge

• nucleus

• protons

• electrons

• neutrons