Physical Science Vocabulary

A model of an atom in which each dot represents a valence electron is called a ________.

• electron dot diagram

• Bohr model

• Lewis structure

• atomic orbital

An atom or group of atoms that has a positive or negative charge is called an ________.

• ion

• isotope

• molecule

• element

An ion with a negative charge is called an ________.

• anion

• cation

• proton

• neutron

An ion with a positive charge is called a ________.

• cation

• anion

• isotope

• radical

The force that holds atoms or ions together as a unit is called a ________.

• chemical bond

• magnetic field

• gravitational pull

• electric current

The force that holds cations and anions together is called an ________.

• ionic bond

• covalent bond

• hydrogen bond

• metallic bond

Notation that shows what elements a compound contains and the ratio of the atoms or ions of these elements in the compound is called ________.

• chemical formula

• empirical equation

• atomic number

• molecular mass

Solids whose particles are arranged in a lattice structure are called ________.

• crystals

• amorphous solids

• liquids

• gases

A chemical bond in which two atoms share a pair of valence electrons is called a ________.

• covalent bond

• ionic bond

• metallic bond

• hydrogen bond

A neutral group of atoms that are joined together by one or more covalent bonds is called a ________.

• molecule

• ion

• isotope

• compound