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chapter 5.3 and 6
vocabulary for these units
26
Chemistry
10th Grade
11/11/2013

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Term
amplitude
Definition
wave's height from zero to the crest
Term
wavelength
Definition
distance between the crests
Term
frequency
Definition
number of wave cycles to pass a given point per unit of time
Term
hertz
Definition
SI units of cycles per seconds
Term
electromagnetic radiation
Definition
a grouping of waves including radio waves, microwaves, infared waves, visible light, ultraviolet waves, x rays, and gamma waves
Term
spectrum
Definition
breaking apart light into different frequencies
Term
atomic emission spectrum
Definition
frequencies of light emitted by an element separated into discrete lines
Term
ground state
Definition
an electron at it's lowest possible state
Term
photons
Definition
particles of light
Term
Heisenberg uncertainty principle
Definition
states that it is impossible to know exactly both the velocity and position of particle at the same time
Term
Periodic Law
Definition
When elements are arranged in ofder of increasing atomic number, there is a periodic repetition of their physical and chemical properties
Term
metals
Definition
good conductors of heat and electric current
Term
non metal
Definition
poor conductors of heat and electric current
Term
metalloid
Definition
properties similar to both metals and nonmetals, under certain conditions can behave like either one
Term
alkali metals
Definition
Group 1A
Term
alkaline earth metals
Definition
Group 2A
Term
halogens
Definition
Group 7A...from the greek "hal" salts, and "genesis" to be born.
Term
noble gases
Definition
Group 8A, sometimes called inert gases because they rarely take part in reactions
Term
transitional metal
Definition
Group B elements, found on main part of periodic table.Full S orbital, presence of electrons in d orbitals
Term
inner transition metal
Definition
Group B elements, found on main part of periodic table. Full S orbital, presence of electrons in F orbitals
Term
atomic radius
Definition
1/2 the distance between the nuclei of two atoms of the same element when atoms are joined.
Term
ion
Definition
atom or group of atoms that has a positive or negative charge.
Term
cation
Definition
ion with a positive charge
Term
anion
Definition
ion with a negative charge
Term
ionization energy
Definition
energy needed to remove an electron from an atom.
Term
electronegativity
Definition
ability of an atom of an element to attract electrons when the atom is in a compound
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