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the study of what substances are made of, and how one substance can be changed into another
chemistry
anything that takes up space and has mass
matter
the units in which mass is measured
grams and kilograms
the amount of matter (mass) in one unit of volume
density
What is the difference between mass and weight?
Mass is the amount of matter that makes up an object; weight is a measure of the pull of gravity on an object
the tiny particles that matter is composed of
atoms
the tiny, extremely dense core at the center of an atom
nucleus
the tiny particles that swarm at tremendous speed around the nucleus of an atom
electrons
the two types of particles which make up the nucleus of an atom
protons and neutrons
anything lacking in an electrical charge
neutral
the simplest kind of atom, with only a single electron whirling around a single proton
hydrogen
name for the number of protons in an atom
atomic number
a substance that is made of only one type of atom
element
the element with the lowest atomic number
hydrogen
the symbol for hydrogen, oxygen, and chlorine
H;O; CL
the transuranium element that is the most abundant
Plutonium
