Sodium Cyanide and Periodic Table Concepts

The video tutorial explains how to write the formula for sodium cyanide. It begins by identifying the element symbols for sodium (Na) and cyanide (CN), noting that cyanide is a polyatomic ion with a charge of 1-. Sodium, found in group one of the periodic table, has a charge of 1+. The tutorial emphasizes that in ionic compounds like sodium cyanide, the charges must balance to zero. Therefore, the formula for sodium cyanide is NaCN. The video concludes with a recap of the formula.

What is the chemical symbol for sodium?

• Na

• Sn

• S

• So

What is the charge of the cyanide ion (CN)?

• 1+

• 2-

• 2+

• 1-

Which group in the periodic table does sodium belong to?

• Group 4

• Group 3

• Group 2

• Group 1

Why does sodium cyanide not have a net charge?

• Because the charges of sodium and cyanide balance each other

• Because it is a neutral molecule

• Because it is a covalent compound

• Because it has no ions

What is the correct formula for sodium cyanide?

• NaCN

• NaC

• NaC2

• SCN