Question

Write the names and symbols of the consituent elements and identify their valencies from the molecular formulae given below:

$KCl,HBr,Mg{Br}_2,K_{2}O,NaH,Ca{Cl}_2,C{Cl}_4,HI,H_{2}S,{Na}_{2}S,FeS,Ba{Cl}_2$

Answer 1

Atomic No:	Valency
$H$	$1^{+}$
$He$	$2$
$Li$	$1^{+}$
$Be$	$2^{+}$
$B$	$3^{+}$
$C$	$4^{+}$
$N$	$3^{-}$
$O$	$2^{-}$
$Fl$	$1^{-}$
$Ne$	Noble gas
$Na$	$1^{+}$
$Mg$	$2^{+}$
$Al$	$3^{+}$
$Si$	$4^{+}$
$P$	$3^{-}$
$S$	$2^{-}$
$Cl$	$1^{-}$
$K$	$1^{+}$
$Ca$	$2^{+}$

$KCl$-Potassium chloride

$HBr$-Hydrogen bromide

$MgB{r}_2$-Magnesium bromide

$K_{2}O$-Potassium Oxide

$NaH$-Sodium hydride

$CaC{l}_2$-Calcium chloride

$CC{l}_4$-Carbon Tetrachloride

$HI$-Hydrogen Iodide

$H_{2}S$-Hydrogen Sulfide

${Na}_{2}S$-Sodium Sulfide

$FeS$-Iron Sulfide

${BaCl}_2$-Barium Chloride