How many neutrons does element x have if its atomic number is 56 and its mass number is 161?

How to convert a density of 0.791g/cm3 to lb/ft3

Which formula can be used to calculate the molar mass of hydrogen peroxide

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's