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Atoms

Across
The elements in the periodic table are arranged in order of increasing _____.
The charge of an electron
This is used to look up elements
The more particles in an atom, the _____ the element
The center of the atom
The neutral particle
The electrons move freely _____ the nucleus
Down
The positive particle
Smallest unit of matter
The number of _____ can change among atoms of the same element
Atoms that have the same number of protons
The element with 2 protons
The nucleus goes in the ____ of an atom