What forms when two atoms combine?

True or false, the three major scales used to measure earthquakes are mercalli scale, richter scale and magnitude scale

What is the molar mass of potassium nitrate, kno3

Which statement is true about hcl? (5 points) select one: a. it is a salt because it increases the concentration of metallic ions. b. it is a salt because it is formed by the reaction of an acid and a base. c. it is an acid because it increases the concentration of hydroxyl ions. d. it is an acid because it increases the concentration of hydronium ions.