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Atomic Nature

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Across
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An electrically neutral subatomic particle within the nucleus.
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The combination of the symbols of the elements in a definite numerical proportion.
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A material the consists of two or more elements united together.
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An atom with one or more electrons removed or added.
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A standard unit of mass based on the Carbon atom.
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The composition of a pure substance is always the same.
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A substance in which all of the atoms have the same atomic number.
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The path of the electron in its motion around the nucleus.
Down
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A negatively charged particle.
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The distribution of electrons in an atom's energy levels.
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Atoms of the same element but different masses.
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An elements number on the periodic table.
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A positively dense center of an atom.
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A positively charged subatomic particle contained in the nucleus.
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The smallest particle of an element.