Trying to find the right answer to this..

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

Classification of Elements and Periodicity in Properties

Short Answer Type

141. Explain why difference in IE, and IE₂ values of sodium is more than that of magnesium.

154 Views

142.

Energy of an electron in the ground state of the hydrogen atom is -2.18 X 10^-18J. Calculate the ionization enthalpy of atomic hydrogen in terms of J mol^-1.

149 Views

Long Answer Type

143. Would you expect the second electron gain enthalpy of O as positive, more negative or less negative than the first? Justify your answer.
Or
What are successive electron gain enthalpies? Explain why second or higher electron gain enthalpy will have positive value.

196 Views

Short Answer Type

144.

Discuss in brief the factors which influence the magnitude of electron gain enthalpy.

128 Views

145.
How does electron gain enthalpy vary along a group?

The electron gain enthalpy of elements become less negative as we move from top to bottom down a group. This is because on moving down a group, there is the simultaneous increase in atomic size and nuclear charge. However, the effect of the increase in size is greater than the increase in nuclear charge. As a result, the incoming electron feels lesser attraction by the large atom. Consequently, electron gain enthalpy becomes less negative down a group.

336 Views