Iron (Fe) has atomic number 26 and number of neutrons =30, the number of protons =.....and electrons=...........and mass number =.................

The atom is neutral.why?

The number of energy levels in the heaviest atom =.........................

The sum of protons and neutrons

potassium has 19 protons and 20 neutrons, the number of electrons =.............and atomic number =.........and mass number =...............

The smallest building unit of matter which share in chemical reactions is the .............

Level (K) is saturated by……….electrons while level (L )is saturated by……..electrons

1)………… are imaginary places or levels in which the electrons revolve around the nucleus.

2) The energy level which has the lowest energy is ………level while the level which has the highest energy is............. level

Number of protons in the nucleus