Since this atom has a total of eight electrons, it also has eight protons. The atom with eight protons in its ... the next electron goes into the fourth level. 4th Period: Potassium and ...

The periodic table captures a subtle pattern that runs ... It is the number of protons in an atom’s nucleus, known as its atomic number, that determines which element it represents.

So, today we're going to look at the periodic table. That thing that you see behind ... For example, lithium (Li), sodium (Na) and potassium (K) all have the same kind of reaction with water.