6. A student is writing a formula for Magnesium Nitrite. He knows nitrite is a polyatomic ion with a charge of -1. Magnesium is an ion with a charge of +2. He concludes that he will need 2 nitrite ions to balance the charge
across the compound. Thus he writes the final formula as MgN, O2. Explain what he has done wrong.

See explanation

Explanation:

First of all, the student has not represented the formula of the nitrite ion correctly. The formula of the nitrite ion is represented as NO2^- whereas the student wrote N,O2.

Then, the charge on magnesium ion has been correctly designated as +2 while the charge on the nitrite ion is correctly designated as -1. Now, the ions can exchange valencies (without signs and we now write them as subscripts) to yield Mg(NO2)2.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

i think is conclusions.i think so