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Classification of Elements and Periodicity in Properties
The IE1, of carbon, is more than that of boron while its IE2 value is smaller. Explain.
IE1 of carbon and boron:
It is primarily due to:
(i) the increase in nuclear charge.
(ii) The decrease in the atomic size of carbon. Due to the combined effect of these two factors, the force of attraction between the nucleus and the electron to be removed increases. Hence IE, value of carbon is more than that of boron.
IE2 of carbon and boron:
The electronic configuration of B+ and C+ ions are:
The electronic configuration of B+ ion is more symmetrical than that of C+ ion since in the former case, both the orbitals are filled. Therefore, the configuration of B+ ion is more stable and its IE2 value is more than that of C+ ion.
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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?
Why are there 10 elements in each series of d-block?
In terms of electronic configuration,
what is common in a given period and group?
Give the general electronic configuration of
(i) Transition elements (ii) Inner transition elements.
Name the group and period to which an element with Z = 15 belongs ?
What are the advantages of periodic classification of elements?
In the modern periodic table, the period indicates the value of:
(a) atomic number
(b) atomic mass
(c) principal quantum number
(d) azimuthal quantum number.
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