Atomic Theory

What is an Atom?

• The smallest particle of an element that retains the chemical properties of that element, consisting of a nucleus and electrons.

• A large structure made up of multiple molecules.

• A type of chemical bond between two elements.

• A collection of similar cells that perform a specific function.

What is a Molecule?

• An electrically neutral group of two or more atoms held together by covalent chemical bonds, forming a discrete unit.

• A single atom that cannot be broken down into smaller parts.

• A mixture of different substances that do not chemically bond.

• A charged particle that has gained or lost electrons.

What is an Ionic Compound?

• A chemical compound composed of ions held together by electrostatic forces, typically formed between a metal and a nonmetal.

• A type of covalent bond formed between two nonmetals.

• A mixture of metals that do not react chemically.

• A compound that contains only one type of atom.

What is an Electron?

• A subatomic particle with a positive electric charge that orbits the nucleus.

• A subatomic particle with a negative electric charge that orbits the nucleus in a region called the electron cloud.

• A type of atom that has no charge.

• A particle that is found in the nucleus of an atom.

What is a Neutron?

• A positively charged particle found in the nucleus of an atom.

• A subatomic particle with no electric charge (neutral) found in the nucleus of an atom, contributing to its mass.

• A negatively charged particle that orbits the nucleus of an atom.

• A particle that is responsible for the chemical properties of an atom.

What is a Radioisotope?

• A stable isotope of an element

• An unstable isotope of an element that undergoes radioactive decay, emitting radiation as its nucleus changes.

• A type of radiation emitted by stable isotopes

• A chemical compound that contains isotopes of different elements.

What is an Ion?

• A neutral atom with no charge

• An atom or molecule that has gained or lost one or more electrons, resulting in a net electrical charge.

• A particle that cannot gain or lose electrons

• A type of molecule that always has a positive charge.

Valence Electrons

• Electrons in the innermost shell of an atom

• Electrons involved in forming chemical bonds

• Electrons that do not participate in chemical reactions

• Electrons that are always positively charged

What is an Anion?

• A positively charged ion formed when an atom loses electrons.

• A negatively charged ion formed when a neutral atom gains one or more valence electrons.

• An atom that has no charge at all.

• A type of molecule that contains both positive and negative charges.

What is an element?

• A pure substance consisting of only one type of atom, which is distinguished by its unique, identifying atomic number.

• A mixture of different types of atoms that can be separated by physical means.

• A compound formed by the chemical combination of two or more different elements.

• A solution that contains dissolved ions and molecules.