Advertisements
Advertisements
Question
State the trends in the variation of electronegativity in groups and periods.
Advertisements
Solution
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
RELATED QUESTIONS
Which of the following elements will have the highest electronegativity?
In the third period the first ionization potential is of the order.
Assertion: Helium has the highest value of ionisation energy among all the elements known
Reason: Helium has the highest value of electron affinity among all the elements known
Which of the following is the second most electronegative element?
IE1 and IE2 of Mg are 179 and 348 kcal mol−1 respectively. The energy required for the reaction \[\ce{Mg -> Mg^2+ + 2e^-}\] is
Which one of the following is true about metallic character when we move from left to right in a period and top to bottom in a group?
What are isoelectronic ions? Give examples.
Energy of an electron in the ground state of the hydrogen atom is −2.18 × 10−18 J. Calculate the ionisation enthalpy of atomic hydrogen in terms of kJ mol−1.
Explain the Pauling method for the determination of ionic radius.
Explain the periodic trend of ionisation potential.
