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

The density of an unknown gas at 98°c and 740 mmhg is 2.50 g/l. what is the molar mass of the gas with work showed?

Which feature do highland climates have that lower elevation areas do not?

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.