Ionic Compounds and Their Formulas

The video tutorial explains how to write the formula for magnesium phosphide, an ionic compound. It begins by identifying magnesium and phosphorus on the periodic table and noting their charges. The tutorial then demonstrates the crisscross method to balance these charges, ensuring the net charge is zero. Finally, the video verifies the formula and concludes with a summary of the process.

What type of compound is formed between magnesium and phosphorus?

• Ionic compound

• Metallic compound

• Molecular compound

• Covalent compound

What is the symbol for magnesium?

• Mg

• Ma

• Mn

• M

How is the periodic table organized that helps in writing formulas?

• By alphabetical order

• By atomic mass

• By charge

• By atomic number

What is the ionic charge of magnesium?

• 0

• 3+

• 2+

• 1+

What is the ionic charge of phosphorus in magnesium phosphide?

• 3-

• 0

• 2-

• 1-

What method is used to balance the charges in magnesium phosphide?

• Cross-multiplication method

• Crisscross method

• Substitution method

• Addition method

What is the result of applying the crisscross method to magnesium and phosphorus?

• MgP

• Mg3P2

• Mg2P3

• MgP2

How do you verify the correctness of the formula for magnesium phosphide?

• By checking the atomic numbers

• By comparing with other compounds

• By ensuring the net charge is zero

• By using a calculator

What is the net charge of magnesium phosphide when the formula is correct?

• Undefined

• Positive

• Negative

• Zero

What is the final formula for magnesium phosphide?

• MgP

• Mg2P3

• Mg3P2

• MgP2