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386
What is the electronic configuration of an element represented as 19
9
X?
A.
1s
2
2s
2
2p
5
B.
1s
2
2s
2
3s
2
3p
3
C.
1s
2
2s
2
2p
3
3s
2
D.
1s
2
2s
2
2p
6
3s
2
3p
6
4s
1
View Answer & Discuss (7)
WAEC 1999
387
Pauli Exclusion Principle is related to
A.
quantum numbers of electrons
B.
reversiblility of equlibrium reactions
C.
electronegativity values of elements
D.
collision theory of reaction rates
View Answer & Discuss (2)
WAEC 1999
388
Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy?
A.
4f
B.
4p
C.
4d
D.
4s
View Answer & Discuss
WAEC 1999
389
Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore
A.
S decays faster than Q
B.
Q is twice as stable as S
C.
Q emits fewer particles than S
D.
S is more stable than Q
View Answer & Discuss
WAEC 1999
390
Calcium atom ionizes by
A.
gaining two electrons
B.
losing two electrons
C.
sharing two electrons
D.
gaining two protons
View Answer & Discuss (1)
WAEC 1999
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