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AP Ch 2 Chemistry (Part I)

Across
The outer energy level/shell of an atom
The bond formed when an electron is transferred from one atom to another
Describes a molecule with a positive charge on one end and a negative charge on the other
Located in the center of the atom; electrons move around this in cloud patterned circles
Unstable isotopes emit this
Atoms with a negative charge
A substance that speeds up or enhances a reaction
Down
Atoms with a positive charge
Makes up 65% of body mass
Isotopes have different numbers of _____
Carry a positive charge and differentiate one element from another
Two atoms that share electrons form this type of bond
Number of electrons in the outer shell of a stable atom
Made up of only one type of atom and cannot be broken down