The Atom
The smallest particle into which an element can be divided and still be the same element.
What is an atom?
The process in which atoms are rearranged to produce new substances.
What is a chemical reaction?
The arrangement of all the known elements.
What is the periodic table?
Elements that are shiny and conduct heat and electricity well.
What is a metal?
A small, dense center of an atom that contains protons and neutrons.
What is a nucleus?
Negatively charged particle in an atom.
What is an electron?
An expression that uses symbols to show the relationship between the starting substance and the substances that are produced by a chemical reaction.
What is a chemical equation?
Each vertical column in the periodic table.
What is a group?
Elements that are not shiny and do not conduct heat and electricity well.
What is a nonmetal?
The abbreviation for an element’s name.
What is a chemical symbol?
Positively charged particle located in the nucleus of an atom.
What is a proton?
Chemical symbols and numbers used to represent a given substance.
What is a chemical formula?
Each horizontal row in the periodic table.
What is a period?
Elements that have some properties of both metals and nonmetals.
What is a metalloid?
A law that states that energy can’t be created or destroyed, however, energy can change from one form to another.
What is the law of conservation of energy?
Uncharged particle located in the nucleus of an atom.
What is a neutron?
A substance that participates in a chemical reaction.
What is a reactant?
The number of protons in the nucleus of an element’s atom.
What is an atomic number?
A chemical reaction that requires an input of energy.
What is an endothermic reaction?
A law that states that matter is neither created nor destroyed in an ordinary physical or chemical change.
What is the law of conservation of mass?
The space around the nucleus where electrons are found.
What is an electron cloud?
A substance formed as the result of a chemical reaction.
What is a product?
The total number of protons and neutrons in an element’s atom.
What is a mass number?
A chemical reaction in which energy is released into the atmosphere.
What is an exothermic reaction?
This substance speeds up a chemical reaction while not being used up at all.
What is a catalyst?