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Week 2 Vocabulary

Across
no charge, located in the nucleus of an atom
one of the basic substances that combine to form all other substances, can't be broken down into simpler substances by ordinary chemical means
a code composed of one to two letters used to represent an element
a charged atom
an electrical property that can be either positive or negative
the number of protons in the nucleus of an atom
Down
the center of the atom
the total mass of the protons, neutrons, and electrons in an atom
the particles that carry a positive charge and are located in the nucleus of an atom
matter that has the same chemical composition throughout and cannot be separated into its parts by physical means
subatomic particles that exist in an area outside the nucleus called the electron cloud
the basic building blocks of matter