The atomic numbers and mass numbers of X respectively ? 21884PO→X+42He
200, 80
212, 82
214, 82
214, 80
An alpha particle consists of 2 protons and 2 neutrons
21884PO→21482X+42He Mass number of X = 214 Atomic number of X = 82
Find the symbol of an element X, if its mass number is A and atomic number is Z respectively.
An ion X2+ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.
Atomic mass of X and Z is 20 and 40 respectively. If X, Y and Z is Dobereiner's Triad. What can be the atomic number of Y?