Advertisements
Advertisements
प्रश्न
State the trends in the variation of electronegativity in groups and periods.
Advertisements
उत्तर
1. Variation of electronegativity in a group: The electronegativity decreases down a group. As we move down a group, the atomic radius increases, and the nuclear attractive force on the valence electron decreases. Hence electronegativity decreases in a group.
Variation of electronegativity along with I group
2. Variation of electron negativity in a period: The electronegativity increases across a period from left to right. Since the atomic radius decreases in a period, the attraction between the valence electron and the nucleus increases. Hence the tendency to attract shared pair of electrons increases. Therefore, electronegativity increases in a period.
Variation of electronegativity along with II group
APPEARS IN
संबंधित प्रश्न
Which of the following elements will have the highest electronegativity?
Various successive ionisation enthalpies (in kJ mol-1) of an element are given below.
| IE1 | IE2 | IE3 | IE4 | IE5 |
| 577.5 | 1,810 | 2,750 | 11,580 | 14,820 |
The element is
Identify the wrong statement.
Which one of the following arrangements represent the correct order of least negative to most negative electron gain enthalpy
Which of the following orders of ionic radii is correct?
Magnesium loses electrons successively to form Mg+, Mg2+ and Mg3+ ions. Which step will have the highest ionisation energy and why?
How would you explain the fact that the second ionisation potential is always higher than the first ionisation potential?
In what period and group will an element with Z = 118 will be present?
Why the first ionisation enthalpy of sodium is lower than that of magnesium while its second ionisation enthalpy is higher than that of magnesium?
Explain the following, give an appropriate reason.
Ionisation potential of N is greater than that of O
