Unit 2 Vocab

A combination of chemical symbols and numbers to represent a substance

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

A chemical reaction in which energy is released to the surroundings, usually as heat

A substance that participates in a chemical reaction

An element that has propertiesof both metals and nonmetals

The smallest unit of an element that maintains the properties of that element

Arrangement of elements in order of their atomic numbers so elements with similar properties are in same column or group

An element on the right side of the periodic table that conducts heat and electricity poorly

A subatomic particle that has no charge and is located in the nucleus of an atom

A vertical column of elements in the periodic table; elements in a group share chemical properties

The weighted average of the masses of all naturally occurring isotopes of an element

The process where atoms are rearranged and chemical bonds are broken/ formed to produce a chemical change of a substance

The law that states that mass cannot be created or destroyed in ordinary chemical and physical changes

A representation of a chemical reaction that uses symbols to show the relationship between the reactants and products

In chemistry, a horizontal row of elements in the periodic table

A chemical reaction that requires energy input, usually as heat

The sum of the numbers of protons and neutrons in the nucleus of an atom

A substance that forms in a chemical reaction

The weighted average of the masses of all naturally occurring isotopes of an element

the law that states that energy cannot be created or destroyed but can be changed from one form to another

An element on the left side of the periodic table that is shiny and that conducts heat and electricity well

A one-, two-, or three-letter abbreviation of the name of an element

A subatomic particle that has a negative charge

The number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element

A subatomic particle that has a positive charge and that is located in the nucleus of an atom

In physical science, an atom’s central region, which is made up of protons and neutrons