Ionic Compounds and Periodic Table

The video tutorial explains how to write the formula for sodium iodide by using the periodic table to identify the elements involved: sodium (Na) and iodine (I). It describes the nature of ionic compounds, highlighting the need to balance the ionic charges of sodium and iodine to achieve a net charge of zero. The tutorial demonstrates that sodium has a +1 charge and iodine has a -1 charge, which balance each other out to form the compound NaI. The video concludes with a recap of the formula and thanks viewers for watching.

Which element is represented by the symbol 'Na' on the periodic table?

• Neon

• Nitrogen

• Sodium

• Iodine

What type of compound is formed between a metal and a non-metal?

• Metallic compound

• Covalent compound

• Molecular compound

• Ionic compound

What is the charge of a sodium ion?

• 1-

• 2+

• 1+

• 0

In which group of the periodic table is iodine found?

• Group 2

• Group 1

• Group 18

• Group 17

What must the net charge of an ionic compound be?

• Positive

• Neutral

• Negative

• Zero

What is the correct chemical formula for sodium iodide?

• Na2I

• NaI2

• Na2I2

• NaI