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Chapter 17 Vocab

Section 1, 2, 3

QuestionAnswer
The smallest particle of an element that still retains the properties of the element. Atom
Positively charged center of an atom that contains protons and neutrons and is surrounded by a cloud of electrons. Nucleus
Particle, composed of quarks, inside the nucleus of an atom that has a charge of 1+. Proton
Neutral particle, composed of quarks, inside the nucleus of an atom. Neutron
Particles surrounding the center of an atom that have a charge of 1-. Electron
Particles of matter that make up protons and neutrons. Quark
Area around the nucleus of an atom where the atom's electrons are most likely to be found. Electron Cloud
Number of protons in an atom's nucleus. Atomic Number
Sum of the number of protons and neutrons in an atom's nucleus. Mass Number
Atoms of the same element that have different numbers of neutrons. Isotope
Weighted-average mass of the mixture of an element's isotopes. Average Atomic Mass
Organized list of all known elements that are arranged by increasing atomic number and by changes in chemical and physical properties. Periodic Table
Vertical column in the periodic table. Group
Uses the symbol for an element and dots representing the number of electrons in the element's outer energy level. Electron Dot Diagram
Horizontal row in the periodic table.;the amount of time it takes one wavelength to pass a fixed point; is expressed in seconds. Period
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