How did knowing the number of valence electrons in one of the alien elements to identify it? explain how the table was used to accomplish this task.

Knowing the number of valence electrons in one of the alien elements helps in identifying it because the number of valence electrons can help categorize the alien element. Similar elements have the same valence electrons and knowing the category of the element can help further analyze the element.

It was ernest rutherford

They can measure  the amount of energy gained or lost