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Answer:

Across
1a fourth phase of matter, in addition to solid, liquid, and gas. in the plasma phase, which exists mainly at high temperature, matter consists of positively charged ions and free electrons.
4a chemical substance made of atoms of two or more different elements combined in a fixed proportion
5a model in which the _____ of an atom are pictured as grouped in concentric shells around the nucleus.
Down
2the smallest particle of an element that can be identified with that element. consists of protons and neutrons in a nucleus surrounded by electrons
3a chart that lists elements by atomic _____ and by electron arrangements, so that elements with similar chemical properties are in the same column.
 
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