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chapter 17

TermDefinition
1. atom which is the smallest piece of matter that still retains the property of the element.
2. atomic number number of protons in an atom's nucleus.
3. average atomic mass weighted-average mass of the mixture of an element's isotopes.
4. eletron particles surrounding the center of an atom that have a charge of 1-.
5. electron cloud area around the nucleus of an atom where the atom's electrons are most likely to be found.
6. electron dot diagram uses the symbol for the element and dots representing the number of electrons in the element's outer energy level.
7. group vertical column in the periodic table.
8. isotope atoms of the same element tat have different numbers of neutrons.
9. mass number sum of the number of protons and neutrons in an atom's nucleus.
10. neutron neutral particle, composed of quarks, inside the nucleus of an atom.
11. nucleus positively charged center of an atom that contains protons and neutrons and is surrounded by a cloud.
12. period horizontal row in the periodic table.
13. periodic table organized list of all known elements that are arranged by increasing atomic number and by changes in chemical and physical properties.
14. proton particle, composed of quarks, inside the nucleus of an atom that has a charge of 1+.
15. quark particles of matter that make up protons and neutrons.
Created by: haileypeck12