tomic mass of a monovalent element is 23 what is its equivalent mass

The equivalent mass of a divalent metal is 31.82. The mass of single atom is

An unknown element has 19 electrons and 20 neutrons, what is the mass number of this element?

An element has an atomic number 15 and mass number 31. What will be thedistribution of electrons in its different shells and the nuclear composition of theatom?

The molar mass of argon is 39.95 g/mole. What is the mass of a single argon atom?

Atomic mass of calcium is 40. The mass of2.5 gram atoms of calcium is _