Chapter 2-1 "The Nature of Matter" Crossword Puzzle

Fill in the blanks in the crossword that bests describe the definitions. If the answer is more then one word, do not use spaces when plugging it in to the puzzle.

An online crossword puzzle with 12 words. Play it free at AgileCrosswords.com.

Clues

• Their nuclei are unstable and break down at a constant rate over time
• A substance formed by a chemical combination of two or more elements in definite proportions
• Negatively charged atom
• In the center of an atom
• Pure substance that consists of entirely one type of atom
• The Greek word "atomos" which means "unable to be cut"
• Positively and negatively charged atom
• Forms when elsectrons are shared between atoms
• The smallest unit of most compunds
• Atoms of the same element that differ in the number of neutrons
• Neutrally charged atom
• Positively charged atom

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