An atom of element X has an atomic number of 11 and a mass number of 23. . a) What is the definition of atomic number?
b) How many protons, electrons and neutrons are in this atom?
c) A different atom of X has an atomic number of 11, but a mass number of 24. Give a
name for these two forms of X.
d) Would these two atoms have similar chemical properties? Give a reason for your
answer.​