Question

(a) Give a reason each for the following: (i) Electronegativity increase from left to right in the periodic table. \[ \begin{array}{c} 2,8 \\ 5=2,8,7 \end{array} \] (ii) Ionisation enthalpy decrease in a group from top to bottom. (iii) Helium has electronic configuration of \( 1 s^{2} \) but it is placed in \( p \)-block in group 18.

          (a) Give a reason each for the following:
(i) Electronegativity increase from left to right in the periodic table.
\[
\begin{array}{c}
2,8 \\
5=2,8,7
\end{array}
\]
(ii) Ionisation enthalpy decrease in a group from top to bottom.
(iii) Helium has electronic configuration of \( 1 s^{2} \) but it is placed in \( p \)-block in group 18.

(a) Give a reason each for the following:
(i) Electronegativity increase from left to right in the periodic table.

2,8

5=2,8,7

(ii) Ionisation enthalpy decrease in a group from top to bottom.
(iii) Helium has electronic configuration of 1 s^2 but it is placed in p-block in group 18.

Added by Lisa B.

Chemistry: The Molecular Nature of Matter

Neil D. Jespersen, James E. Brady,… 7th Edition

Chapter 7

Instant Answer

Solved by Expert Henry R

Step 1

- As you move from left to right across a period, the number of protons in the nucleus increases, leading to a greater positive charge. This increased nuclear charge attracts the electrons more strongly, increasing electronegativity. Show more…

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(a) Give a reason each for the following: (i) Electronegativity increase from left to right in the periodic table. \[ \begin{array}{c} 2,8 \\ 5=2,8,7 \end{array} \] (ii) Ionisation enthalpy decrease in a group from top to bottom. (iii) Helium has electronic configuration of \( 1 s^{2} \) but it is placed in \( p \)-block in group 18.