Which pair of atomic numbers represents s-block elements?
3 = 1s2, 2s1
12 = 1s2, 2s2, 2p6, 3s2
Since, last electron enters in s-orbitals, these are s-block elements.
Which of the following pairs has both members of the same period of the Periodic Table?
An element with atomic number 20 will be placed in which period of the Periodic Table?
The elements with atomic numbers 9, 17, 35, 53, 85 are all
In which block does 106th element belong?
Which group of the Periodic Table does not contain only metals?
The elements having the electronic configuration
[kr] 4d10f14, 5s2p6d2, 6s2 belongs to which block
Mendeleef’s Periodic Table is upset by the fact that
If Aufbau rule is not followed, K-19 will be placed in
Which of the following has largest size?
Which of the following has largest ionic radius?