What is significant about the elements within the same group of the periodic table?

In which situation can a mixture always be called a solution

Which of the following describes a situation where competition between producers exists

The chemical equation below shows the reaction of sodium (na) and chlorine (cl) to form sodium chloride (nacl). 2na + cl2 → 2nacl in this equation, which of the following is a reactant? i. sodium ii. chlorine iii. sodium chloride