Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
11 Cards in this Set
- Front
- Back
- 3rd side (hint)
|
electron configuration
|
the arrangement of electrons in an atom, is known as the atoms_____
|
|
|
|
ground state electron configuration
|
The lowest energy arrangement of the electrons for each element is ______
|
|
|
|
Electrons are added to orbitals one by one according to 3 basic rules...
1st?(Aufbau principle) |
1) shows order in which electrons occupy orbitals
a. an electron occupies the lowest-energy orbital that can recieve it |
|
|
|
2nd basic rule of electron configuration?
What do the arrows mean? |
reflects the importance of the spin quantum number
Pauli exclusion principle- no two electrons of the same atom can have the same set of four quantum #'s - an orbital can hold 2 electrons of OPPOSITE spin ~ each arrow represents one of the atom's 2 electrons * the direction of the arrow indicates the electrons spin |
Pauli exclusion principle
|
|
|
3rd rule of elec. config.?
|
-requires placing unpaired electrons in seperate orbitals in the same sublevel = electron-electron repulsion is minimized so electron arrangements have the lowest energy level possible
|
Hunds rule
|
|
|
Hunds rule
|
- orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron
-all electrons in singley ocupied orbitals must have the same spin |
|
|
|
orbital notation
|
an unoccupied orbital is represented by a line w/ the orbital's name written underneath the line
Ex) H/He name of orbital= H & He-1s above line= H-one up arrow/ He- 1 up arrow ,1 down arrow |
|
|
|
Electron-Configuration notation
|
# of electrons in sublevel is ahown by adding a subscript
ex) He-1s^2 |
|
|
|
inner shell electrons
|
electrons that are not in the highest occupied energy level
|
|
|
|
noble gas configuration
|
an outer main energy level fully occupied, in most cases, by 8 electrons
|
|
|
|
fifth period elements differ from elements 1st 4 periods?
why? |
start w/ "5s" orbital rather than the "4s"
-succesive electrons are added -b/c 4f and 5d orbitals are so close in energy, deviations of the simple rule of elec. config. occur |
18 elements per period
|
