Science Atom and Element Final!

Vocabulary practice cards for atom science, including atomic models, subatomic particles, chemical properties, and classifications of matter.

WHMIS

Workplace hazardous materials information system.

Physical changes

A substance changes in form or appearance, but a new substance is not formed; often described as "Reversible".

Chemical changes

A change that produces one or more new substances; often described as "Irreversible".

Isotopes

Atoms with the same number of protons but a different number of neutrons in the nucleus.

Ions

Atoms or molecules that have an electric charge.

Molecules

Groups of two or more atoms that are chemically bonded together.

Neutrons

Particles that have no electric charge.

Protons

Positively charged particles.

Electrons

Negative charged particles.

Planetary model

Atomic model proposed by Niel Bohr stating that electrons live in energy levels or shelves.

Rutherford model

Model developed by Ernest Rutherford after shooting alpha particles at thin gold foil, which discovered a positive nucleus.

Plum-pudding model

Model developed by J.J. Thompson using a cathode ray tube that discovered negatively charged particles.

Billiard ball method

John Dalton's proposal that all materials are composed of small indivisible spheres called atoms.

Atom

The basic building block of all life.

Elements

A pure substance made up of one type of particle that cannot be broken down.

Compound

A pure substance made from two or more elements that are chemically combined.

Democritus

Proposed that all matter is made up of tiny, indivisible particles called atoms.

Dalton

Known for the atomic theory stating matter is made of tiny particles called atoms.

Thompson

The scientist who discovered negatively charged particles.

Rutherford

The scientist who discovered the positive nucleus.

Bohr

The scientist who proposed that electrons exist in energy shelves.

Modern quantum mechanical model

States that electrons are in electron clouds (orbitals) around the nucleus, and their exact positions cannot be unknown with certainty.

Pure substances

A type of matter consisting of one type of particle that has a fixed composition, such as water and carbon dioxide.

Mixtures

Two or more substances that are physically combined and can be separated with chemical reaction.

Heterogenous

Mixtures in which substances are not evenly mixed and different parts can be seen.

Homogenous

Mixtures in which substances are evenly mixed.

Metals

Elements that are usually shiny and are good conductors of heat and electricity, such as iron.

Metalloids

Elements that possess both metal and nonmetal properties, such as Boron.

Non-metal

Elements that do not conduct electricity well.