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Atomic Nature

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