Chemistry

2. A subatomic particle that has a positive charge and that is found in the nucleus of an atom
4. Two or more different atoms held together by chemical bonds
6. Sum of the atomic masses of elements in a compound expressed in grams
9. A substance made up of atoms of two or more different elements joined by chemical bonds
10. A table that shows the elements, their atomic number, symbol, and average atomic mass; elements with similar chemical properties are grouped together
11. The process of purifying a liquid by boiling it and condensing its vapors
14. Smallest particle of an element
15. Negatively charged particle; located outside the atomic nucleus
16. An energy level representing the distance of an electron from the nucleus of an atom.
18. A substance consisting of two or more substances mixed together but not chemically bonded together
19. One of two or more atoms with the same atomic number but with different numbers of neutrons
21. A subatomic particle that has no charge and that is found in the nucleus of an atom

1. a technique that separates the components of a mixture on the basis of the tendency of each to travel or be drawn across the surface of another material
3. The sum of the numbers of protons and neutrons in the nucleus of an atom
5. Separation of a mixture into fractions that differ in boiling points
7. A process that separates materials based on the size of their particles
8. The weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of carbon-12; average mass of atoms of an element
12. A horizontal row of elements in the periodic table
13. The number of protons in the nucleus of an atom
17. A substance composed of one type of atom only
20. Vertical column of elements in the periodic table