Atoms, Electrons, Orbitals 2 Flashcards
Single electron of hydrogen occupy _ orbital
1s
Two electrons of helium occupy a _ orbital
1s
Hydrogen and helium electron configurations written as _ (2)
H: 1s1 (1 above s)
He: 1s2
Spin quantum number of an electron can have a value of either _ or _
+ 1/2
-1/2
According to the Pauli exclusion principle, two electrons may occupy same orbital only _
When they have opposite spin
Opposite spin aka _
Paired spin
Because two electrons fill 1s orbital, third electron of lithium must _
Occupy orbital of higher energy
No orbital can contain
More than two electrons
Lithium electron configuration
1s22s1
Period of a periodic table corresponds to principal quantum number of _
Highest numbered occupied orbital (n = 1, etc.)
With beryllium (with 4 electrons) the _ becomes filled
2s level
Next orbital to be filled after 2s (beginning with boron) are (3)
2px
2py
2pz
2pxyz orbitals are of equal energy and are characterized by
Boundary surfaces described as dumbbell shaped
Axes of 2p orbitals are at
Right angles to each other
Regions (red and blue) of a single orbital may be separated by
Nodal surfaces
