One calcium and two chlorine atoms are near each other. An electron from each atom feels the attraction from the other atom's nucleus. The attraction by the chlorine atoms is stronger than the ...

The atom with eight protons in its nucleus (atomic number 8 ... the next electron goes into the fourth level. 4th Period: Potassium and Calcium—Electrons go into the fourth energy level. A small piece ...

The best-known examples are the calcium H and K and the strontium pair (4216, 4077). According to modern theories of spectral emission, these lines are due to an atom which has lost one electron.

For example, the mass number of argon atoms and calcium atoms can both be 40. The atomic number of a chlorine atom is 17 and its mass number is 35. Calculate the number of protons, neutrons and ...