Quantum Numbers and Atomic Orbitals

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Section Review 4.2 and 4.3

How many quantum numbers are used to describe the energy state of an 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, and f:14

The number of possible orbital shapes for the third energy level is

3

The maximum number of electrons that can occupy the 5 orbitals at each energy level is

two, if they have opposite spins

The spin quantum number indicates that the number of possible orientations for an electron
in an orbital is

2

The values +1/2 and -l/2 specify an electron's

possible orientation in an orbital

When n represents the principal quantum number of an energy level, the number of electrons
per energy level is

2n^2

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 different 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

5

_____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 correct sequence in ascending energies of atomic sublevels is

5s, 4d, 5p, 6s

The statement that an electron occupies the lowest energy orbital that can receive it is

the Aufbau principle

In the correct electron-dot notation for the phosphorus atom

one pair of dots and three single dots

The electron-configuration notation for scandium (atomic number 21) would show the three
highest energy electrons to have the notation

3d^1 4s^2

The element with the electron-configuration notation 1s^2 2s^2 2p^6 3s^2 3p^2

Si (z = 14)

In the correct electron-dot notation for sulfur (atomic number 16), the symbol S is surrounded
by

two pairs of dots and two single dots

If the highest main energy level of an atom has the sand p orbitals filled with electrons, it is
said to have an

octet

The noble gas configuration is an outer main energy level fully occupied by

8 electrons

The atomic sublevel with the next highest energy after 4p is

55

"Orbitals of equal energy are each occupied by one electron before anyone orbital is occupied by a second electron
and all electrons in singly occupied orbitals must have the same spin" is a statement of

hunds rule

The electron configuration for the carbon atom (C) is 1s^2 2s^2 2p^2. The atomic number of carbon is

6

The electron-configuration notation for the element with atomic number 11 is

1s^ 2s^2 2p^6 3s^1

The number of electrons in the highest energy level of the argon atom (atomic number 18) is

8

An element with eight electrons in its outermost main energy level is called a(n)

noble gas

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