7th grade unit 7

the law that states mass cannot be created nor destroyed in ordinary chemical and physical changes

• chemical change

• physical change

• law of conservation of mass

• law of conservation of energy

a change of matter from one form to another without change in chemical properties

• chemical change

• physical change

• law of conservation of mass

• physical expansion

a change that occurs when one or more substances change into entirely new substances with different properties

• chemical change

• physical change

• law of conservation of mass

• chemical expansion

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

• atomic number

• mass number

• atom

• electron

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

• atom

• electron

• neutron

• proton

the number of protons in the nucleus of an atom

• electrons

• atom

• mass number

• atomic number

subatomic particle that has a negative charge

• proton

• electron

• neutron

• atomic number

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

• atomic theory

• nucleus

• electron

• electron cloud

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

• electron cloud

• nucleus

• neutron

• cell

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

• proton

• electron

• neutron

• nucleus