What is the name of group 6a,7a, and 8a

Who discovered a pattern to the elements in 1869?

Which factor is likely to impact the possible number of compounds? presence of unlimited number of elements in the periodic table the inability of atoms to align perfectly with other atoms the ability of all elements to react with every other element all elements being equally reactive

Which answer below correctly identifies the type of change and the explanation when magnesium comes into contact with hydrochloric acid