☰
Classification of Elements and Periodicity in Properties
With which of the following electronic configuration an atom has the lowest ionisation enthalpy?
1s2 2s22p5
1s2 2s22p3
1s2 2s22p5 3s1
1s2 2s22p6
C.
1s2 2s22p5 3s1
The electronic configuration 1s2 2s22p5 3s1 shows lowest ionisation energy because this configuration is unstable due to the presence of one electron is s- orbital. Hence, less energy is required to remove the electron.
Sponsor Area
Give the ‘liquid elements’ in the periodic table.
What is valency of an element?
Gallium was named by Mendeleev as
What are magic numbers?
Which property is the basis of long form of periodic table?
How many elements are placed in each period of the p-block?
What is the number of groups in: (i) p-block (ii) d-block?
How many elements are present in:
(i) second period
(ii) fourth period
(iii) sixth period?
What is the name given to the s-block elements?
To which block the element with outer electronic configuration 4s23d10 belongs?
Sponsor Area
Sponsor Area