What is mass number? How is it related to atomic number?

What is mass number of an atom?

What is wave number ? How it is related to wavelength ?

Define atomic number of an element. How is it related to the mass number ?

The mass number of fluorine is 19 and its atomic number is 9. Calculate the number of protons , electrons and neutrons in the fluorine atom. How will the fluorine atom form an ion ?

How is nuclear size related to its mass number?

Define the terms atomic number and mass number how are they related to each other? In which case the atom of the element has same number of protons and electrons?

What is the name given to elements with same mass number and different atomic number ?

What is meant by atomic mass number ? Explain how the atomic number and mass number of carbon are 6 and 12 respectively.