Electrons Shells Flashcards
(7 cards)
What do electrons occupy energy levels called?
Shells
What does the lowest energy level or the innermost shell do?
Fills with electrons first
How many electrons can the first shell hold?
2 electrons
How many electrons can the second shell hold?
8 electrons
How many electrons does the third shell hold?
Can hold up to 18 electrons but for the first 20 elements it will not have more then 8 electrons
How is the element’s reactivity is determined?
It is determined by the number of electrons in which in the outer shell of its atom
How can an atom be perfectly stable
To be perfectly stable an atom requires a full outer shell of electrons