The ground state electronic configuration for silicon is 1s22s22p63s23p2 . Which of the following elements would be expected to be chemically similar to silicon?
a. boron with configuration 1s22s22p1
b. lithium with configuration 1s22s1
c. carbon with configuration 1s22s22p2
d. sodium with configuration 1s22s22p63s1
[Ques. 2] The ground state electronic configuration for sodium is 1s22s22p63s1 . What is the orbital quantum number of the last (3s1) electron?
a. 3 b. 1
c. 2 d. 0
[Ques. 3] Imagine that an electron had a spin of 5/2 so that its spin quantum number, ms, could have the following six values: ms = +5/2, +3/2, +1/2, 1/2, 3/2, and 5/2 . If this were true, the first element with a filled shell would be
a. He with 2 electrons.
b. Be with 4 electrons.
c. C with 6 electrons.
d. O with 8 electrons.
[Ques. 4] How many electrons are in chromium's (atomic number 24) next to outer shell (n = 3)?
a. 1
b. 14
c. 12
d. 13
e. 8
[Ques. 5] The restriction that no more than one electron may occupy a given quantum state in an atom was first stated by which of the following scientists?
a. Bohr
b. de Broglie
c. Heisenberg
d. Pauli
[Ques. 6] Aluminium has atomic number 13 . In its ground state, how many electrons are in its n = 1 shell?
a. 6
b. 2
c. 3
d. 10
e. 16
[Ques. 7] In a plot of probability of finding the electron in the hydrogen ground state versus the distance from the nucleus, the maximum occurs
a. at a0, the first Bohr radius.
b. at slightly less than a0.
c. at slightly more than a0.
d. at 2 a0.
[Ques. 8] The quantity ________, where is the wave function, represents the probability per unit volume of finding an electron in that volume.
a. 1/2
b.
c. 3/2
d. 2
[Ques. 9] The quantum mechanical model of the hydrogen atom suggests a visual picture of the electron as which of the following?
a. raisin in pudding
b. probability cloud
c. planetary orbiting body
d. light quantum
[Ques. 10] The quantum number that can have only two possible values is the
a. principal quantum number.
b. orbital quantum number.
c. orbital magnetic quantum number.
d. spin magnetic quantum number.
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