pmt Flashcards
1
Q
isotopes 79,81 in Br, avg= 79.908, ct abundance o e
A
79x + 81(1-x)=79.908
-2x=-1.092
x=54.6%
2
Q
df orbital
A
region where up 2 2 e- (w opposite spins) R likely 2 be
3
Q
nm 3 rules 4 filling e- shells
A
Aufbau- e- enter lowest en level
Pauli’s exculsion principle- 2 e- per orbital
Hund’s rule- 1 e- in every orbital of = en (eg 2P) b4 add 2nd
//a low e-. pulls 2 otrs down.then takes empty pair of seats on bus
4
Q
why 4s filled b4 3d (https://www.physicsandmathstutor.com/chemistry-revision/a-level-edexcel/atomic-structure-and-periodic-table/ -> electron configuration knockhardy
A
en increase from en level 3->4 small
wide range of dif en of orbitals in en level 3 a 4
so smallest of 4< biggest of 3
