Question

In lake test of $A{l}^{3+}$ ion, there is the formation of colored floating. It is due to:

• A. Adsorption of litmus by $H_{2}O$
• B. Adsorption of Iitmus by $Al(OH{)}_3$
• C. Adsorption of litmus by $Al(OH{)}_4^{-}$
• D. None of these

Answer 1

The correct option is B Adsorption of Iitmus by $Al(OH{)}_3$

Elements that can donate electrons are called metals. They form positive ions by losing electrons. The elements that accept electrons are called non-metals. They form negative ions by gaining electrons. Metals have 1 to 3 electrons in the outermost shell of their atom and non-metals have 4 to 8 electrons in the outermost shell.
$32=\left[Ar\right]3d^{10}4s^2{P}^2$ Valance electrons$=4$
$34=\left[Ar\right]3d^{10}4s^2{P}^4$Valance electrons$=6$
$36=\left[Ar\right]3d^{10}4s^2{P}^6$ Valance electrons$=8$
$38=\left[Ar\right]3d^{10}4s^2{P}^{6}5s^2$Valance electrons$=2$

Therefore the element with atomic number $38$ is a metal.