Q. No.| 1. | Lothar Meyer plotted the physical properties against the atomic number and obtained a periodically repeated pattern. |
| 2. | French geologist, Chancourtois made a cylindrical table of elements to display the periodic recurrence of properties. |
| 3. | Mendeleev realized that some of the elements did not fit in with his scheme of classification if the order of atomic number was strictly followed. |
| 4. | Seaborg was awarded the Nobel Prize in chemistry for his work and Element 101 has been named Seaborgium (Sg) in his honour. |
The elements in which electrons are progressively filled in 4f-orbitals are called:
| 1. | Actinoids | 2. | Transition elements |
| 3. | Lanthanoids | 4. | Halogens |
Among the following sequences, the sequence contains atomic numbers of only representative elements is/are-
(a) 3, 33, 53, 87
(b) 2, 10 ,22, 36
(c) 7, 17, 25, 37, 48
(d) 9, 35, 51, 88
Choose the correct option
1. (a), (d)
2. (b), (c)
3. (c), (d)
4. (b), (d)
| 1. | ununoctium | 2. | ununennium |
| 3. | unnilennium | 4. | unununnium |
The electronic configuration of Palladium is:
1. [Rn] 5f3 6d1 7s2
2. [Rn] 5f5 6d1 7s2
3. [Rn] 5f2 6d1 7s2
4. None of the above.
| Statement A: | The elements Z = 117 belongs to chalcogen family and the electronic configuration would be [Rn] 5f146d107s27p4 |
| Statement B: | The element with Z = 120 belongs to Group 2 (alkaline earth metals), and the electronic configuration would be [Uuo]8s2 |
The correct option is-
| 1. | Statement A is correct, B is wrong. |
| 2. | Statement A is wrong, B is correct |
| 3. | Both A and B are wrong. |
| 4. | Both A and B are correct |
The correct increasing order of metallic character among' the following elements is:
Si, Be, Mg, Na, P
1. P < Si < Be < Mg = Na.
2. P < Si > Be < Mg < Na
3. P > Si > Be >Mg > Na
4. P < Si < Be < Mg < Na.
If an atom has electronic configuration 1s22s22p63s23p63d34s2, we will place it in group number:
| 1. | Fifth | 2. | Fifteenth |
| 3. | Second | 4. | Third |
The element having electronic configuration [Kr]4d104f14, 5s25p6, 6s2 belongs to:
1. s-block
2. p-block
3. d-block
4. f-block
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