CHEMISTRY · Single correct · A Level · Chemistry · Atomic structure · Atomic structure
Problem
Which statement is not true about 56138Ba2+ ?
(1) It has 56 protons, 82 neutrons and 58 electrons.
(2) The atomic number is 56 and the mass number is 138.
(3) It has more neutrons than protons.
(4) It has more protons than electrons.