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Classification of Elements and Periodicity in Properties
What is the basic difference between the terms electronegativity and electron gain enthalpy?
The main points of difference are as:
| Electronegativity | Electrogain enthalpy |
| 1. It is the relative tendency of an atom in a molecule to attract the share pair fo electron towards itself in a covalent bond. | 1. It is the tendency of an isolated gaseous atom to attract an electron to form a negative ion. |
| 2. It is a number and has no units. | 2. It is measured in electron volts/atom or kJ mol-1. |
| 3. It is the property of a bonded atom. | 3. It is a property of an isolated atom. |
| 4. Electronegativity values are only the comparative values. | 4. Electron affinity values are the actual values. |
| 5. It changes regularly in a period or group. | 5. It does not change regularly in a period or a group. |
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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?
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 ?
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