ATOMIC STRUCTURE AND PERIODIC TABLE XI
1. The four quantum numbers of the last electron of Cr-24 are ....
a. n = 3, l = 1, m = 1, s = + 1/2
b. n = 3, l = 2, m = 0, s = - 1/2
c. n = 3, l = 2, m = 2, s = + 1/2
d. n = 4, l = 0, m = 0, s = - 1/2
e. n = 4, l = 0, m = 0, s = + 1/2
2. Electron configuration which not allowed is ....
a. 2s2 2p3
b. 3s2 3p4
c. 4s1 3d5
d. 4s2 3d8
e. 5s3 4d2
3. The last electron of an element has the value of quantum numbers n = 3, l = 2, m = 0, s = + 1/2. The atomic number of this element is ....
a. 21
b. 23
c. 25
d. 26
e. 28
4. Electron configuration of an element in the exited is ....
a. 4s1 3d5
b. 4s1 3d10
c. 4s1 3d7
d. 4s2 3d5
e. 4s2 3d10
5. Electron configuration of X2- is (Ne) 3s2 3p6. The correct atatement about this element is ....
a. X is an inert gas
b. in the periodic table is in the block d
c. QNs of the last electron are n = 3, l = 1, m = -1, s = - 1/2
d. electron configuration of X is (Ne) 3s2 3p6 4s2
e. X is in the VIIIA group and 3 rd period
6. The position of an element X in the periodic table is in the 3rd period and 'p' block. The possible atomic number of X is ....
a. 9
b. 10
c. 11
d. 12
e. 13
7. An element X-27, in the periodic table is in the ... period and ... group and ... block.
a. 4, VIIIA, p
b. 4, VIIIB, s
c. 4, VIIIB, d
d. 3, VIIA, p
e. 3, VIIB, d
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