What does the number 84 in the name krypton-84 represent?
b. atomic number
c. mass number
d. twice the number of protons

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change

Why did southern business leaders want to increase the number of slaves

Using the periodic table, complete the following. element: hydrogen symbol: h₂ molecular weight: g mass of one mole: g/mol