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Atomic Theory Test
Atomic Theory
23
Chemistry
10th Grade
12/04/2011

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Cards

Term
Electron density
Definition
Way of showing probability of finding an e-
Term
What is an orbital
Definition
Area around an atom with greatest probability of finding an e-
Term
In what way does the Bohr model of an atom violate the uncertainty principle
Definition
Can't give specific point of an e-
Term
What is the significance of matter waves in describing atomic structure
Definition
Electron has wave like characteristics
Term
The maximum number of electrons in a 2d sublevel is
Definition
0, no 2d sublevel
Term
What do psi and psi squared represent in the Quantum Mechanical Model of the atom
Definition
psi= solution to wave equation (orbitals)
psi squared= probability of finding an electron
Term
How does the probability of finding an electron in a 1s orbital vary with distance from the nucleus. Compare this to the 2s orbital
Definition
Probability decreases as the distance from the nucleus increases. 2s orbital is larger with node
Term
Why do in certain cases do the electrons shift and appear to violate conventional electron configuration rules
Definition
Stable half-filled or filled d orbitals
Term
What are the allowed values of the quantum number "l" on the 5th energy level?
Definition
0,1,2,3,4
Term
The quantum number "l" is
Definition
The shape of an orbital
Term
The s orbital is a ____ orbital
Definition
nondirectional
Term
The quantum "n" is
Definition
The number of sublevels in a shell
Term
For orbitals to be degenerate, which quantum numbers must be the same
Definition
n,l
Term
Is light a wave or a particle? Explain
Definition
It's both. It will behave like a particle in some instances, and like a wave in others. This phenomenon is called particle-wave duality.
Term
Is an electron a wave or a particle? Explain
Definition
Electrons display properties of both.
Term
Why is impossible to measure the position and velocity with infinite accuracy at the same time?
Definition
In quantum mechanics, the Heisenberg uncertainty principle states a fundamental limit on the accuracy with which certain pairs of physical properties of a particle, such as position and momentum, can be simultaneously known. In other words, the more precisely one property is measured, the less precisely the other can be controlled, determined, or known.
Term
Describe Planck's original hypothesis and what Einstein did
Definition
He viewed his strange assumptions as mathematical constructions to provide a formula that fit the experimental data. It was not until later, when Einstein used very similar ideas to explain the Photoelectric Effect in 1905, that it was realized that these assumptions described "real Physics" and were much more than mathematical constructions to provide the right formula.
Term
The quantum number "ms" stands for?
Can only be?
Definition
Spin direction
+or- 1/2 based on arrow direction
Term
The quantum number "ml" can only be
Definition
-l to l
Term
Pauli's exclusion principle
Definition
Two e- spin in different directions
Term
The quantum number "l" can be
Definition
n-1
Term
Is matter a wave?
Definition
Wave with particle and wave like characteristics
Term
Uncertainty principle equation
Definition
(delta x)(delta p) > or = to Planck's/2
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