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chemistry semester

metric system used to determine the units of measurements
scientific figures the number of all known digits reported in measurements plus on estimated digit
scientific method a systematic approach used in scientific study
base units based on an object or event in the physical world
experiment a set of controlled that test a hypothesis
big bang theory the theory on how the universe expands or continues to expand
variable capable of being changed or varied
hypothesis a tentative, testable statement or prediction about what has been observed
precision refers to how close a measure is to one another but may not be accurate
control the standard that is used for comparison
percent error the ratio of an error to an accepted value
theory an explanation supported by many experiments
neutral neither positive nor negative
isotope atoms of the same element with different numbers of neutrons
mass number the number after an elements name representing the sum of its protons and neutrons
average atomic mass the mass of the atom itself
atomic number the number of protons in an atom
nucleus the extremely small, positively charged, dense center of an atom that contains positively charged protons and neutral neutrons
electron a particle with a negative charge
neutron a particle with a neutral charge
proton a particle with a positive charge
subatomic particles a particle smaller than an atom
compound a chemical combination of two or more different elements
atom smallest particle in an element
cloud shapes determined by which the density at a given point is proportional to the probably of finding the electron
orbitals three-dimensional regions around the nucleus
energy level determine how far the electron is from the nucleus
period a horizontal row of elements in the periodic table
electromagnetic spectrum includes all forms of electromagnetic radiation
noble gas configuration the arrangement of noble gases in an atom
electron configuration the arrangement of electrons in an atom
wavelength the shortest distance between equivalent points on a continuous wave
energy the capacity to do work
frequency the number of waves that pass a given point per second
valence electron the electrons in an atom's outermost orbitals
quantum the minimum amount of energy that can be gained or lost by an atom
ground state the lowest possible state of an atom
excited state the higher energy state of an atom
wave-particle duality the exhibition of both wavelike and particle like properties by a single entity
octet rule atoms lose, gain, or share electrons in order to acquire the stable electron configuration of a noble gas
electronegativity the relative ability of an elements atoms to attract electrons in a chemical bond
ionic radius the measure of all atoms ions in a crystal lattice
atomic radius a measure of the size of atoms
periodic trend the increasing or decreasing of atomic radius
nonmetals generally gases or dull
metalloids has physical and chemical properties of metals and nonmetals
metals a metal that is solid at room temperature
group names the names that classify what types of elements there are
group a vertical column of elements in the periodic table
atomic symbol the letter that represents the element
atomic mass the weighted average mass of the isotopes of that element
Created by: babygirl248