Atomic structure

2. are members of a family of an element that all have the same number of protons but different numbers of neutrons
4. combined mass of all the protons neutrons and electrons that make up an atom
6. a column of elements on the periodic table
9. the number of protons found in the nucleus of an atom which uniquely identifies its elements
11. a subatomic particles with a mass of land charge of 0
13. the electrons in the outermost shell of energy level of an atom
14. a column in the periodic table of the chemical elements

1. the organized array of all the chemical elements in order of increasing atomic number
3. a structural model of an atom
5. a stable negatively charged component of atom
7. smallest unit into which matter can be divided without the release of electrically charged particles
8. a chemical element that exhibits some metal and some non metal properties
10. a chemical element is any substance that cannot be decomposed into simpler substances by oridinary chemical process
12. a positively charged particles that reside within the atomic nucleus