Exam 1: Key Terms

8. The state of matter with a definite volume but no definite shape.
9. A mixture in which the composition is uniform throughout, also known as a solution.
10. A change in which the form of matter is altered but one substance is not transformed into another.
11. Elements found in Group 18 of the periodic table, known for being inert.
14. Elements that are good conductors of heat and electricity, typically shiny and malleable.
15. The lightest and most abundant element in the universe, with atomic number 1.
16. Materials made of only one type of atom or molecule; elements or compounds are examples.

1. A mixture in which the composition is not uniform throughout.
2. Highly reactive elements found in Group 17 of the periodic table.
3. A process that involves one or more substances transforming into new substances with different properties.
4. Elements that are poor conductors of heat and electricity, found on the right side of the periodic table.
5. The amount of space that a substance or object occupies.
6. The dense central part of an atom, containing protons and neutrons.
7. Atoms of the same element that have different numbers of neutrons.
12. Negatively charged particle orbiting the nucleus of an atom.
13. Positively charged particle found in the nucleus of an atom.