Atomic + Molecular Structure Flashcards
What did Dalton’s Atomic Theory state?
- All elements are composed of atoms
- Atoms of 1 element differ from atoms of other elements
- All compounds of composed of different atoms
- No destruction/construction of atoms
Protons weigh about
1 amu
The atomic # (or Z) equals to the
Number of protons
The further the valence electron is from the nucleus the
Weaker the attraction is between the electron and the nucleus
Rutherford stated that the atom has a
Densely-charged nucleus which accounts for a small portion of the volume
Planck developed the first quantum theory, proposing that
Energy is emitted as electromagnetic radiation in quanta
What is the energy of a quantum?
E = h • f
What is the angular momentum (L) according to the Bohr model?
L = nh / 2π
The energy of the electron is given by
E = -Rh / n^2
The energy of an electron is related to the
Orbital radius
The smaller the radius means the
Lower the energy
What is the electromagnetic energy of protonss?
E = h•c / wavelength
Each element maintains its own
Atomic emission spectrum
The Lyman series describes emission to
n = 1 (UV)
The Balmer series describes emission to
n = 2 (UV + Vis)
The Pascher series describes emission to
n = 3 (Inf)
What is the equation to find energy level transitions?
E = -Rh (1/ni^2 - 1/nf^2)
The pauli exclusion principle states that
No 2 electrons in a given atom have the same 4 quantum numbers
The max number of n correlates to the
Number of the period
The larger the n the
Higher the energy level + radius
The max number of electrons in a SHELL is denoted by
2n^2
As the distance from the nucleus increases, the
Difference in energy between adjacent shells decreases
The azimuthal quantum number (l) ranges from
0 to n-1
When l = 0, the orbital is
S