Comp 2

substance with atoms that are all alike
substance formed from two or more elements in which the exact combination and proportion of elements is always the same.
the smallest particle of an element that still retains the properties of the element.
positively charged center of an atom that contains protons and neutrons and is surrounded by a cloud of electrons.
particle, composed of quarks, inside the nucleus of an atom that has a charge of +1.
neutral particle, composed of quarks, inside the nucleus of an atom.
particle surrounding the center of an atom that has a charge of -1.
particle of matter that makes up protons and neutrons.
electron cloud
area around the nucleus of an atom where the atom’s electrons are most likely to be found.
amount of matter in an object.
atomic number
number of protons in an atom’s nucleus.
mass number
sum of the number of protons and neutrons in an atom’s nucleus.
atoms of the same element that have different numbers of neutrons.
average atomic mass
weighted-average mass of the mixture of an element’s isotopes
chemical property
any characteristic of a substance, such as flammability, that indicates whether it can undergo a certain chemical change.
periodic table
organized list of all known elements that are arranged by increasing atomic number and by changes in chemical and physical properties.
vertical column in the periodic table.
electron dot diagram
uses the symbol for an element and dots representing the number of electrons in the element’s outer energy level.
horizontal row in the periodic table

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