element
Elements song
2010 Nobel prize for physics: graphene
PENCIL graphite, PAPER CLIP: Al 13.
elements
Magnesium: bone & teeth, co-factor in enzymes; chlorophyll.
atom
He atomic number? 2 Mass? 4. Electron cloud and shells.
excited
Argon atomic number
18:
1s2, 2s2, 2p6, 3s2, 3p6.
Since all of its 3p orbitals are filled, it is considered a noble
gas.
The 3rd principal energy level can also accept up to 5 3d orbitals (3d5), so it can be
said that the 3rd "shell" has a maximum of 18 electrons (quantum mechanical model),
but 8 electrons (Bohr model) in the 3rd "shell" is stable.
shells
PENCIL graphite, PAPER CLIP: Al 13; matter: has mass + space;
Hindenburg
!
H/He balloon
,
elements.
gecko
Gecko adhesion by Van der Waals forces (12:00 - 16:30)
Van de Graaff electrostatic generator: static by chemical reaction.
===
SQ 1=B 2=a 3=b 4=B? 5=C? 6=B? 7=b 8=a 9=b 10=b
- Orbitals:
4s electrons lower energy than 3d electrons - transition elements.
- Heat of vaporization
2.26 J/g 100ºC.