Question

Write The Chemical Formula Of The Compounds By Criss-Cross Method-
i)Magnesium Chloride
ii)Sodium Sulphate
iii)Aluminium Carbonate
iv)Calcium Oxide​

Answer 1

Answer:

MgCl2

Na2So4

Al2(Co3)3

CaO2

Answer 2

$\huge \color {cyan} \fbox \colorbox {black} {answer}$

An alternative way to writing a correct formula for an ionic compound is to use the crisscross method.

...

5.5: Writing Formulas for Ionic Compounds.

Crisscross Method Write the formula for lead (IV) oxide

1. Write the symbol and charge of the cation (metal) first and the anion (nonmetal) second. Pb4+

$\large\color {cyan} \fbox \colorbox {black} {hope \: it \: helps}$