1. A difference in the ______ number of atoms means the atoms are of different elements.
2. Combined atoms form a ______
3. Isotopes enable scientist to determine _______ of some rocks and fossils.
4. The ______ properties of an element determine how the element will change when it reacts with another element.
5. An example of _______ is water.
6. Table salt is an example of a ________.
I have the rest of the questions, but I'm stuck on these. Help?
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