Atomic Structure and the Bohr Model Flashcards
What makes up the mass number?
protons + neutrons
What is the atomic number?
The # of protons an element has It’s the box number that an element appears in on the periodic table
Ex: Mg is in box 12, C is in box 6
Is the atomic # always the same?
ALWAYS the same for elements with the same letter symbol
Ex: C will always be 6, Mg will always be 12
What determines the atomic number for an element? In other words, atomic # is equal to what?
The atomic number is equal to the number of protons an element has. The number of protons in any given element NEVER changes
Is the mass # always the same?
No. An element can have a different # of protons which will give it a different mass #. You can find how many protons a element has by: neutrons= Mass# - Atomic#
Atoms of the same element that have different mass #s are called?
Isotopes
Quantization
when your position can only exist at certain distinct levels, but not in between those levels. (You can stand anywhere on a ramp but not a staircase, so your position is quantized on the stairs.)
Bohr model indicates?
indicates that electrons can only exist at certain distances from the nucleus (N = 1, 2, 3, 4), thus the electrons’ distance from the nuclei is quantized (there is no n = 1/2)
Do energy shells get smaller or larger as they get further away from the nucleus?
Smaller
Ex: n=5 and n=6 are closer together than n=1 and n=2
are electrons allowed to be anywhere they want around the nuclei or in certain locations?
Certain locations. They are quantized!
Is there a correlation between energy shells and how much energy it takes to shift an electron?
Yes. The larger the gap between energy shells the most energy it takes to move an electron. It takes more energy to move from n=2 to n=1 than n=5 to n=4
