Short Answer TypeAssign the position of the element having outer electronic configuration:
(i) ns2np4 for n = 3
(ii) (n-1)d2ns2 for n = 4, and
(iii) (n-2) f7 (n-1)d1ns2 for n = 6, in the periodic table.
Give the atomic number and electronic configuration of the following elements:
(i) The third alkali metal
(ii) The second transition element
(iii) The fourth noble gas
(iv) The first halogen.
Long Answer TypeElements A, B, C and D have atomic numbers 7, 19, 29 and 36 respectively. Write the electronic configuration and also predict their period, group and block.
(i) A(Atomic number 7):
Electronic configuration: 1s2 2s2 2p3
Period = 2nd
Group = 15
Block = p-block
(ii) B(Atomic number 19):
Electronic configuration: 1s2 2s2 2p6 3s2 3p6 4s1
Period = 4th
Group = one (1)
Block = s-block
(iii) C (Atomic number 29):
Electronic configuration:
1s2 2s2 2p6 3s2 3p6 4s1 3d10
Period = 4th
Group = Eleven (11)
Block = J-block
(iv) D (Atomic number 36)
Electronic configuration:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
Period = 4th
Group = Eighteen (18)
Block = p-block
The elements Z = 107 and Z = 109 have been made recently; element Z = 108 has not been made. Indicate the groups in which you will have the above elements.
Short Answer TypeAn element belongs to third period of the p-block. It has four valence electrons. Predict its group. How many unpaired electrons does it has?
The elements with Z = 117 and 120 have not yet been discovered. In which family/group would you place these elements. Also give the electronic configuration in each case.
Long Answer TypeShort Answer TypeArrange the following elements in the increasing order of their metallic character: Si, Be, Mg, Na, P.
What are periodic properties of the elements? Name a few important periodic properties.
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