Science Vocabulary Chapter 17

weighted-average mass of the mixture of an element's isotape

area around the nucleus of an atom where the atom's electrons are most likely to be found

particles surrounding the center of an atom that have a charge of 1-

vertical column in the periodic table

atoms of the same element that have different numbers of neutrons

sum of the number of protons and neutrons in an atom's nucleus

element that shares some properties with metals and some nonmetals

element that is typically hard, shiny solid, is malleable, and is a good conducter of heat and electricity

neutral particle, composed of quarks, inside the nucleus of an atom

element that usually is a gas or brittle solid;, is not malleable or ductile, is a poor conductor of heat and electricity, and is not shiny

positively charged center of an atom that contains protons and neutrons and is surrounded by a cloud of electrons

organized list of all known elements that are aranged by increasing atomic number and by changes in chemical and physical properties

horozintal row in the periodic table

particle, composed of quarks, inside the nucleus of an atom that has a charge of 1+

particles of matter that make up protons and neutrons

made up of electrons;uses the symbol of the element and dots to represent the electrons in the outer energy level