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Atoms Unit Part 1

Horizontales
The mass of an atom. Approximately equal to the number of protons and neutrons in an atom.
Table in which all known elements are arranged by atomic number
Atoms that are made of smaller particles
Anything that has mass and takes up space
A negatively charged particle
A neutral subatomic particle that is found in the nucleus of an atom.
Verticales
the number of protons in the nucleus of an atom
A substance that is made up of one kind of atom
electron on the outer energy level
where electrons are located in an atom
the center of an atom made up of protons and neutrons
model of an an atom proposed by Niels Bohr
small area in the center of an atom in which most of an atom's mass and positive charge is concentrated
A subatomic particle that has a positive charge and that is found in the nucleus of an atom
Smallest unit of matter that retains the properties of an element