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

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.

If an element 'X' has mass number 11and its has 6 neutrons, then write its representation

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 ?

An atom of an element contains 29 electron and 35 neutrons. Deduce a. the number of protons b. the electronic configuration of that element

An atom of an element contains 29 electrons and 35 neutrons . Deduce - the number of protons

Answer the following questions in one sentence each : State the relation between the number of protons, the number of neutrons and the atomic mass number (A) of an element.

The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39 respectively. a. Calculate the average atomic mass of element B according to Dobereiner's triads. b. Compare the average atomic mass of B with its atomic mass. c. What could the elements A, B and C be?

Give scientific reasons : Atomic number is a more fundamental property of an element than its atomic mass.