Question

Consider the following statements and arrange in the order of true/false as given in the codes.
$S_1$: Long form of periodic table completely helps in predicting the oxidation state of elements.
$S_2$: Metallic and covalent radii of potassium are 203 pm and 230 pm respectively.
$S_3$: Formation of $S{e}^{2-}$ and $A{r}^{-}$, both the absorption of energy.

• A. FFT
• B. TTT
• C. TTF
• D. TFT

Answer 1

The correct option is A FFT

$S_1$: Long form of periodic table does not help at all in predicting the oxidation state of elements, additional information regarding the number of unpaired electrons is also required.

$S_2:r_{metallic}>r_{covalent}$, In covalent bond formation some part of the combining orbitals become common due to overlapping.

$S_3$: is correct statement as argon has completely filled outer shell and in the formation of $S{e}^{2-}$ there is electrostatic repulsions between $S{e}^{-}$ anion and incoming electron (due to same charge).