In a business letter, the if present, begins two lines below the last line of the inside address.

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

On your wedding day your lover gives you a gold ring of mass 3.67 g. 48 years later its mass is 3.44 g. on the average how many atoms were abrated from the ring during each second of your marriage? the atomic mass of gold is 197 u. don't enter units

If the specific heat of a metal is 0.850 j/g °c, what is its atomic weight?