☰
Classification of Elements and Periodicity in Properties
Differentiate between ionisation enthalpy and electron gain enthalpy ?
| 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. |
Sponsor Area
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.
Sponsor Area
Sponsor Area