An ion has a charge of -1 . It has eighteen electrons and twenty neutrons. Its mass number is

A monoatomic (X) ion has a charge of +3 the nucleus of the ion has a mass number of 45. the number of neutrons in the nucleus is 1.14 times that of number protons. Find out : (a) Number of electrons in atom x. (b) Number of electrons in X^(3+) ion. (c) Configurations of X, X^(3+) and X^(1+) ion. (d) Suggest which of the these (X,X^(3+) and X^(+) ) are paramagentic (e) the Total magnetic moment of X^(+) ion.

The ion of an element has 3 positive charges. The mass number of atom of this element is 27 and the neutrons is 14. What is the number of electrons in the ion ?

The mass number of an atom whose unipositive ion has 10 electrons and 12 neutrons is