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Section 2.2

Across
The core of an atom that contains protons and neutrons.
The energy that matter possesses as a result of its location.
The capacity to cause change.
A subatomic particle having a positive charge.
The total mass of an atom.
An isotope that is unstable and gives off detectable particles of energy.
The outer most energy shell of an atom. Contains valence electrons.
A subatomic particle having a neutral charge.
Down
An electron in the outer most electron shell.
The number of protons in the nucleus of an atom.
An atomic form of an element in which the number of protons is the same, but the number of neutrons is different.
An energy level of electrons.
The total number of protons and neutrons in an atom's nucleus.
A subatomic particle having a negative charge.
A measure of mass for atoms and subatomic particles.
The smallest unit of matter that retains the properties of an element.