giúp mình 4 câu này với ạ

`a. RO_3 =>` Nhóm `VIA => RH_2`

`{%R}/{%H} = R/2 = {94,12}/{5,88} => R = 32`

=> Sulfur ( S )

`b. R_2O_5 =>` Nhóm `VA => RH_3`

`{%R}/{%H} = R/3 = {82,35}/{17,65} => R = 14`

=> Nitrogen ( N )

`c. RH =>` Nhóm `VIIA => R_2O_7`

`{%R}/{%O} = {2R}/{7 . 16} = {58,86}/{41,14} => R = 80`

=> Bromine ( Br )

`4. RH_4 =>` Nhóm `IVA => RO_2`

`{%R}/{%O} = R/{2 . 16} = {46,67}/{53,33} => R = 28`

=> Silicon ( Si )

`3a.`

`RO_3=>R∈VIA`

`=>` công thức hydrogen: `RH_2`

`%H=5,88%`

`=>{1.2}.{R+1.2} .100% =5,88%`

`=>R~~32`

`=>R:S`

`3b.`

`R_2O_5=>R∈VA`

`=>` công thức hydrogen: `RH_3`

`%R=82,35%`

`=>R/{R+1.3} .100% =82,35%`

`=>R~~14`

`=>R:N`

`3c.`

`RH->R∈VIIA`

`=>` oxide: `R_2O_7`

`%R=58,86%`

`=>{2R}/{2R+16.7} .100% =58,86%`

`=>R~~80`

`=>Br`

`3d.`

`RH_4->R∈IVA`

`=>` oxide : `RO_2`

`%R=46,67%`

`=>R/{R+16.2} .100% =46,67%`

`=>R~~28`

`=>R:Si`