Page 21 - PRE-U STPM CHEMISTRY TERM 1

Chemistry Term 1 STPM
7 The shapes of the five d orbitals are:

z z
y y
CHAPTER

2
x x

d xz d yz
z z

y y

x
x

d xy d x 2 y 2
–
z
y

x

d x 2

8 Note that in the set of d orbitals, two of them, d 2 2 and d 2, have
x – y z
their ‘lobes’ along the x, y and z axes while the other three have their
'lobes' in between the axes.

2.3 Electronic Configurations 2008/P2/Q1(a)
2010/P1/Q4
2011/P1/Q3, Q5
1 There are three rules that govern the filling of electrons in an atom:
The Aufbau Principle, the Pauli’s exclusion Principle and Hund’s 2011/P2/Q5(a)
rule. 2013/P1/Q3, Q18(c)
2014/P1/Q3
2 The Aufbau Principle states that in the ground state of an atom, the 2014/P1/Q18(b)
electrons must occupy orbitals in order of increasing energy. The 2015/P1/Q6
diagrams below show the arrangement of the energy levels and the 2015/P1/Q18
order they are filled.
2016/P1/Q4
2018/P1/Q19(b)

51

02 Chapter 2.indd 51 3/26/18 3:14 PM