The Role Of Electrons

Why Are Electrons So Important Anyway?

Electron shells

-electrons are 1 third of what makes up what is called an atom. the other two particles are called protons (p+) and neutrons.

- electrons spin unbelievably fast around the centre of an atom, the nucleus.

- electrons spin in what is called a shell or energy level, which are numbered 1, 2, 3, and 4 and are named K, L, M, and N. An easier way to remember this is imagining a pea as the nucleus of our atom, which sits in a table tennis ball, (K shell) that sits inside a tennis ball, (L shell) which sits inside a basket ball, (M shell) which sits inside a beach ball. (N shell

-the electrons are spinning around fast, whilst staying as far away from each other as they can. (they back away from each other, due to their negative charge)

-There are 2 electrons in the first shell, because the first shell is the smallest and if there were more than two, they would get too close.

-There can be more atoms in the other 3 shells because they are bigger. The L shell can hold a max. of 8 electrons, the M shell can hold a max. of 18 electrons, and the N shell can hold a max. of 32 electrons.



Ions

-Atoms are electrically neutral because the number of protons equals the number of electrons, balancing the positive and negative charges. (because remember a proton is positive and a neutron is negative)


-If the balance changes, then an atom becomes charged and forms an ion

Big image
above, this is what an atom for Chlorine (Cl) would look like. each element has a different amount of electrons.