period 3 -AQA

The Period 3 elements, Na, Mg, Al, Si, P and S, all form oxides when the elements are burned in an excess of oxygen.
(i) Give the formula of an oxide of one of these elements in which the element is not in its highest oxidation state.

Original post by Qer

The Period 3 elements, Na, Mg, Al, Si, P and S, all form oxides when the elements are burned in an excess of oxygen.
(i) Give the formula of an oxide of one of these elements in which the element is not in its highest oxidation state.

So what is the problem?

Reply 2

Qer

OP

16

Original post by charco

So what is the problem?

Can i write MgO here?

Original post by Qer

Can i write MgO here?

No.

Two of the elements from more than one oxide. You are supposed to know that.

You are to write one of the ones with the lower of the oxidising state.

Reply 4

Qer

OP

16

Original post by charco

No.

Two of the elements from more than one oxide. You are supposed to know that.

You are to write one of the ones with the lower of the oxidising state.

I don't know. whats the answer?

Reply 5

westcw13

12

Original post by Qer

The Period 3 elements, Na, Mg, Al, Si, P and S, all form oxides when the elements are burned in an excess of oxygen.
(i) Give the formula of an oxide of one of these elements in which the element is not in its highest oxidation state.

Hi!

From the oxides of these elements that are in the spec, S is the only one (I think) that we need to know off the back of our hands as having variable oxidation states.

It forms SO2 and SO3, so I'll let you do the rest :smile: