An ion with mass number 56 contains 3 units of positive charge and 30.4% more neutrons than electrons. Assign the symbols to this ion.

An ion with mass number 37 possesses one unit of negative charge. If the ion contains 11.1% more neutrons than the electrons, find the symbol of the ion.

An element with mass number 81 contains 31.7% more neutrons as compared to protons. Assign the atomic symbol.

Answer the following questions in one sentence each : The atomic mass number of an element is 18, and the element contains 8 electrons. What is the number of protons and neutrons in it ?

The tatal number of neutrons in dipositve zinc ion with mass number 70 is

The number of unpaired electrons in Cr^(3+) ion is_____

The region that contains free electrons, negative ions and positive ions is

Answer the following questions in one sentence each : An atom contains 2 protons, 2 electrons and 3 neutrons. State its atomic number and atomic mass number.

Total number of lone pairs of electrons in I_3^- ion is _______.