Unit 2-Atomic Structure & Bohr Models Flashcards
Mass of a proton, neutron, electron.
1, 1, 1/2000 amu
Atomic Number
(z) the number of protons in an atom
Mass number
of protons +# of neutrons
Neutrons determine the ________
isotope
isotopes
atoms of an element that have the same atomic number but different number of neutrons (changes mass)
Average Atomic Mass
the average mass of all the naturally occurring isotopes of an element
-found on the periodic table
Electrons determine the ______
ion
Protons determine the ___________
element
-Can be found on periodic table
-symbolized by “z”
-=# of protons
-must be a whole number
Atomic Number
-Can not be found on periodic table
-symbolized by “a”
-=# of protons +# of neutrons
-must be a whole number
Mass Number
Charge of an Ion =
of protons-# of electrons
Electromagnetic radiation
A form of energy that exhibits wavelike behavior as it travels through space
Wavelength
the distance between corresponding points on adjacent waves
Frequency
the number of waves that pass by a point in a given amount of time.
Long wavelength= __________ frequency
low
Low frequency= _________ Energy
low
Photoelectric effect
emission from electrons from metal when light shines on it
Dislodging electron depends on _____________, not intensity.
light frequency
Quantum is _________ _________ to frequency.
directly proportional
Quantum
amount of energy needed to move an electron from one energy level to another.
Lower energy levels are:
-Closer to nucleus
-farthest apart from each other
-takes more energy to get to the next level
Actual Atomic Mass
the mass of an individual isotope of an element
Metalloid’s location on periodic table
Along the staircase on the right of the periodic table
Metal’s location on the periodic table
Left of the metalloids (excluding hydrogen)
Nonmetals location on the periodic table
Right of the metalloids (and hydrogen)
Representative Elements
The headings starting with A
Representative elements in the same group have similar properties:
a) same # of valence electrons
b) same oxidation # (ionic charge)
Alkali Metals location
Group one (1A) (not hydrogen)
Alkaline Earth Metals
Group 2 (IIA)
Halogens
row 17 (VII A)
Noble Gases
Row 18 (VIIIA)
Lanthanides
La-Yb
Actinides
Ac-No
Transition metals
rows 3-12v
Density formula
D=m/v
