What characteristic of argon makes it useful in welding?

• It is a solid at room temperature.

• It is highly reactive.

• It is a good conductor of electricity.

• It is unreactive and protects the weld area.

Which groups in the periodic table generally follow the octet rule?

• Only Group 18

• All groups follow the octet rule

• Groups 3 to 12

• Groups 1 & 2 and 13 through 18

How do sodium and chlorine achieve stability when they react?

• By sharing electrons equally

• By both gaining electrons

• By forming a covalent bond

• By sodium donating an electron to chlorine

Which element is an exception to the octet rule and achieves stability with only two electrons?

• Oxygen

• Hydrogen

• Carbon

• Nitrogen

Why is the octet rule considered an important principle in chemistry?

• It explains why all elements are reactive.

• It helps predict the chemical behavior of elements.

• It is only applicable to noble gases.

• It is a rule that applies to all elements without exception.