AS 101:ATOMSAND MATTER
ATOMS & MATTER:
Protons (+) +1
Electrons (-) -1
Neutrons (~) 0
*Protons and Electrons Attract
Protons and neutrons have same mass, need 2000 electrons to equal mass of 1 proton.
Protons and neutrons 10 m (same size)
Electrons are smaller and fuzzier
Atoms = Protons, neutrons and electrons:
Equal numbers of protons and electrons
Typically, neutrons ~ protons
Nucleus of p and n (10 -15m to 10-1m)
Cloud of electrons (10 )0
Why do electrons stay w/ the nucleus?
Why do protons stay in the nucleus?
If an atom id 200m wide, how bug is the nucleus
Attracted towards center by Attracted towards center by
electrical forces gravity
Can not describe position and Easy to describe position and
velocity clearly velocity.
Orbits frequently change
Conservation of energy,
Energy of an electron in an atom: AS 101:ATOMSAND MATTER
Not possible to determine the position of an electron in an atom.
Only certain electron energies are permitted