According to the Heisenberg uncertainty principle.______________ The position an

Question

According to the Heisenberg uncertainty principle.______________ The position and momentum of a particle can be measured precisely, but not at the same time. The position of a particle cannot be measured precisely. The momentum of a particle cannot be measured precisely. Neither the position nor the momentum of a particle can be measured precisely. The spheres below represent atoms of Li. Be, B, and F (not necessarily in that order.) r = 72 pm r = 83 pm r = 112 pm r = 152 pm Which of the these represents an atom of B? ____________ sphere(a) sphere(b) sphere(c) sphere(d) Which orbital-filling diagram violates Hund's rule? Which element, indicated by letter on the periodic table above, contains one f electrons? A b C D

Explanation / Answer

9.

Answer is (D)

A represent Ca

B represent Ti

C represent Ge

D represent Cerium (Ce). It is in lanthanide series.

Atomic number of Ce = 58

Electronic configuration of Ce = [Xe] 4f1 5d1 6s2

8.

Answer is (A)

Hund's rule states that every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin.

In case of (A), two 3d orbital are vacant but in one orbital it has a pair of electron.

7. Answer is (B)

Atomic radius decreases from left to right within a period. This is caused by the increase in the number of protons and electrons across a period. One proton has a greater effect than one electron; thus, electrons are pulled towards the nucleus, resulting in a smaller radius.

Start by taking a look at a periodic table and making a note of where Li, Be, B and F are located.

Notice that all of them are lcoated in period 2 of the periodic table.

Decreasing order of atomic radius of Li, Be, B and F are as

Li > Be > B > F

6. Answer is (A).

Heisenberg uncertainty principle states that it is impossible to measure two properties of a quantum object, such as its position and momentum (or energy and time), simultaneously with infinite precision.

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