Question

If the difference in the size of $N{a}^{+}$ and $L{i}^{+}$ is $X$ $\stackrel{o}{A}$ and $C{s}^{+}$ and $N{a}^{+}$ is $Y$ $\stackrel{o}{A}$ respectively. Then the difference in the size of $C{s}^{+}$ and $L{i}^{+}$ is:

• A. $(X-Y)\stackrel{o}{A}$
• B. $(Y-X)\stackrel{o}{A}$
• C. $(X+Y)\stackrel{o}{A}$
• D. $\left(\frac{X+Y}{2}\right)\stackrel{o}{A}$

Answer 1

Answer: (C)

$(X+Y)\stackrel{o}{A}$

$r_{Na+}-r_{Let}=X{A}^0\to \left(1\right)$

$r_{CS+}-r_{Na+}=Y{A}^0\to \left(II\right)$

Add (I) & (II)

$\therefore r_{cs+}-r_{u+}=(X+Y)A^0$