Sodium Is a Highly Reactive Metal and Chlorine Is a Toxic

Multiple Choice

Sodium is a highly reactive metal and chlorine is a toxic gas, but when they come together the resulting material, sodium chloride (a white solid) , is essential for life. Which of the following is true when sodium and chlorine are brought into contact with one another?

A) They form a heterogeneous mixture.
B) They form a homogenous mixture
C) They form a new element.
D) They form a compound.