Question

визначте валентність елементіву формулах оксидів​

Answer 1

Ответ:

$\stackrel{+2}{Ca}\,\stackrel{-2}O$, $\stackrel{+3}{Al_2}\stackrel{-2}{O_3}$, $\stackrel{+}{Na_2}\stackrel{-2}{O}$, $\stackrel{+4}{C}\stackrel{-2}{O_2}$, $\stackrel{+3}{S}\stackrel{-2}{O_3}$.

$\stackrel{+4}{N}\stackrel{-2}{O_2}$, $\stackrel{+2}{Zn}\stackrel{-2}{O}$, $\stackrel{+6}{Cr}\stackrel{-2}{O_3}$, $\stackrel{+}{K_2}\stackrel{-2}{O}$, $\stackrel{+7}{Cl_2}\stackrel{-2}{O_7}$.

$\stackrel{+5}{P_2}\stackrel{-2}{O_5}$, $\stackrel{+6}{Cr}\stackrel{-2}{O_3}$, $\stackrel{+}{Li_2}\stackrel{-2}{O}$, $\stackrel{+2}{Zn}\stackrel{-2}{O}$, $\stackrel{+4}{S}\stackrel{-2}{O_2}$.

$\stackrel{+2}{Ba}\stackrel{-2}{O}$, $\stackrel{+}{Cu_2}\stackrel{-2}{O}$, $\stackrel{+3}{Mn_2}\stackrel{-2}{O_3}$, $\stackrel{+4}{Mn}\stackrel{-2}{O_2}$, $\stackrel{+4}{Si}\stackrel{-2}{O_2}$.