# 4.2 and 4.3 review

## Terms

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- how many quantum numbers are used to describe the energy state of electron in an atom
- 4
- a spherical electron cloud surrounding an atomic nucleus would best represent
- an s orbital
- the letter designations for the first four orbital quantum numbers with the number of electrons per orbital at each sublevel are
- s:2 p:6 d:10
- the number of possble orbital shapes for the third energy leve is
- 3
- the maximum number of electrons that can occupy the s orbitals at each energy level is
- 2 if they have opposite spins
- the spin quantum number indicates the number of possible orientations for an electron in an orbital is
- 2
- the values +1/2 and -1/2 specigy an electron's
- possible orientation in an orbital
- When n reperestns the principal quantum number of an energy levle, the number of electrons per energy level is
- 2nsquared
- at n=1, the total number of electrons that could be found is
- 2
- the quantum number that indicates the position of an orbital about the three axes in space is the ___ quantum number
- magnetic
- the ______ orbitals are dumbbell shaped and directed along the X, Y, and Z axes
- p
- the number of diccerent sublevels within each energy level of an atom is equal to the value of the ______ quantum number
- principle
- there are ___ orbitals for the d sublevel
- five
- ____ electrons are needed to completely fill the fourth energy level
- 32
- a particular main energy level can hold 18 electrons. in this case n equals
- 3
- the corrct sequence in ascending energies of atomic sublevels is
- 5s, 4d, 5p, and 6s
- the statement that an electron occupies the lowest energy orbital than can receive it is
- the Aufbau principle
- in the correct electron-dot notation for the phosphorous atom (15) the symrbol p is surrounded bny
- one pair of dots and three singles
- the electron configuration notation for scandium 21 would show the three highest energy electrons to have the notation
- 3d14s2
- the element with the electron configuration notation 1s2 2s2 2p6 3s2 3p2 is
- Si(z=16)
- the atomic sublevel with the next highest energy after 4 p is
- 5s
- orbitals of equal energy are each occupied by one electron before any one orbital is occupied by a second electron an dall electrons in a sinly occupied orbital must have the same spin
- hunds rule
- the number of electrons in the highest energy level of the argon atom is
- 8
- an element with eight electrons in its outer most main energy level is called an
- noble gas