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1)………… are imaginary places or levels in which the electrons revolve around the nucleus.
Energy levels
The number of energy levels in the heaviest atom =.........................
7 energy levels
2) The energy level which has the lowest energy is ………level while the level which has the highest energy is............. level
K level has the lowest energy , Q has the highest
Level (K) is saturated by……….electrons while level (L )is saturated by……..electrons
K filled by 2 and( L) level filled by 8
The smallest building unit of matter which share in chemical reactions is the .............
Atom
The atom is neutral.why?
because,Number of negative electrons = Number of the positive protons
Number of protons in the nucleus
Atomic number
The sum of protons and neutrons
mass number
Iron (Fe) has atomic number 26 and number of neutrons =30, the number of protons =.....and electrons=...........and mass number =.................
protons =6, electrons =6 and mass number = protons +neutrons = 26 +30= 56
potassium has 19 protons and 20 neutrons, the number of electrons =.............and atomic number =.........and mass number =...............
electrons = protons = 19, atomic number = protons =19 and mass number = protons +neutrons = 20 +19= 39
