change from a solid to a liquid

elements that make up Group 17 in the periodic table

particle that has a negative charge - located in rings outside the nucleus of an atom. You can figure out the number of electrons by looking at the atomic number of an element.

able to be hammered into different shapes

center, or core, of an atom (where the protons and neutrons are located)

state of matter with a definite volume but no definite shape

process in which new substances with new chemical and physical properties are formed

substance that is formed in a chemical reaction

state of matter that has no definite shape or volume

number of protons in the nucleus of an atom. This is the same number as the number of electrons

place in an electron cloud where an electron is most likely to be found - rings. Remember, 2-8-18-32.

smallest part of an element that can be identified as that element

way of writing the name of a compound using chemical symbols

number that shows how many molecules of a substance are involved in a chemical reaction

anything that has mass and takes up space

force of attraction that holds atoms together

elements that make up Group 18 in the periodic table

total mass of the protons and neutrons in an atom

number written to the lower right of a chemical symbol in a chemical formula

any of the four physical forms of matter

change from a gas to a liquid

particle that has no charge - located in the nucleus of an atom. You can figure out the number of neutrons by SUBTRACTING the atomic Mass minus the atomic number.

substance that CANNOT be chemically broken down into simpler substances

change from a liquid to a gas at the surface of the liquid