Atomicity is the number of

Atomic number is the number of ________ is an atom.

Which of the following pairs is/are correctly matched ? 1. Isotopes : Atoms with same atomic number but different atomic mass 2. Isobars : Atoms with same number of neutrons but different atomic number 3. Isotones : Atoms with same mass number but different atomic number Select the correct answer using the code given below :

An atom having atomic mass number 13 has 7 neutrons. What is the atomic number of the atom.

An atom having atomic mass number 13 has 7 neutrons. What is the atomic number of the atom.

The number of unpaired electrons in cobalt atoms is (atomic number of Co= 27)