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Classification Of Elements And Periodicity In Properties

Question

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Differentiate between ionisation enthalpy and electron gain enthalpy ?

Solution

Ionisation enthalpy	Electron gain enthalpy
1. It is the amount of enthalpy required to remove the most loosely held electron from an isolated gaseous atom of an element in the ground state.	1. It is enthalpy change when an electron is added to the neutral gaseous atom of an element to form the monovalent negative ion.
2. When the electron is removed, cation is formed.	2. When the electron is added, anion is formed.
3. Noble gases have a high value of ionisation enthalpy.	3. Noble gases have a positive value of electron gain enthalpy.

Some More Questions From Classification of Elements and Periodicity in Properties Chapter

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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