The number of electrons and neutrons of an element is 18 and 20 respectively . Its mass number is

The number of electrons in the atom of an element X is 18 and the number of neutrons is 22. Which of the following is the correct representation of an atom of this element?

The atomic number and mass number of an element are 16 and 32 respectively.Find the number of proton electrons and neutrons in it. State its valency .Is this element a metal or a non-metal .Justify your answer.

The atomic number and the mass number of an element M are 12 and 24 respectively . Calculate the number of neutrons in an atom of the element.

The number of protons, electrons and neutrons in a species are equal to 17,18 and 18 respectively. Which will be the proper symbol of this species?