The best explanation for the organization of mendeleev's periodic table by atomic mass rather than atomic number is that ―

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

Which describes fat? a: a carbohydrate that produces energy b: a nucleic acid that directs cell function c: a lipid that stores energy d: a protein that speeds up a chemical reaction