Physical Science

3. (Family) A vertical column on the periodic table; elements in the same group share similar properties.
5. A negatively charged particle that orbits the nucleus of an atom.
6. Number The total number of protons and neutrons in the nucleus.
8. A neutral particle in the nucleus of an atom.
11. Bond The force that holds atoms together in a molecule or compound.
14. Electrons The electrons in the outermost shell of an atom; they determine how an atom bonds.
15. The smallest particle of an element that still has the properties of that element.

1. A positively charged particle in the nucleus of an atom.
2. The dense center of the atom that contains protons and neutrons.
4. Table A chart that organizes all known elements by their properties and atomic number.
7. Number The number of protons in an atom; identifies the element.
9. A substance made of two or more elements that are chemically combined.
10. Two or more atoms bonded together.
12. A pure substance made of only one kind of atom.
13. A horizontal row on the periodic table; elements in the same period have the same number of energy levels.