Question

An element m is present in 3rd a group of periodic table write formula of its chloride and oxide

Answer 1

as the element belongs to 13th group so it will have 3 electrons in its outermost shell. it needs 5 more electrons to complete its octet and so it requires a lot of energy to gain electrons so it will loose 3 electrons.

clorine has electronic configurqtion as 2,8,7. it needs to gain 1 electron.

now let the element be X
formula therefore becomes,
X Cl
3 ↗↖ 1

XCl3

formula of oxides=

X O
3 ↗↖ 2
X2O3

hope it helps you.
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Answer 2

Answer:

The oxide will be in the form of R2O2 and chloride will be in the form of RCL3

Explanation:

According to the Mendeleev's periodic table's formula of oxides and hydrides.

And we can also calculate the formula oxides and hydrides by their valencies too.

X. O

3. 2

Ans: X2O3.

X. Cl

3. 1

Ans: XCl3.