This shows that lithium atoms have three electrons, two in the first shell and one in the second shell. Sodium has 11 electrons. These will be arranged as: 2 electrons in the first shell 8 ...

A silicon atom has four electrons in its outer shell and bonds tightly with four surrounding silicon atoms creating a crystal matrix with eight electrons in the outer shells. However, phosphorus ...

Isotopes are atoms of the same element that have a different ... couldn't explain them without the introduction of the shell ...