What element has the same number of valence electrons as iodine and the same number of electron energy levels as lithium? Explain how you arrived at your answer

Calculate the mass of silver needed to react with chlorine to produce 126g if silver chloride?

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?