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What is the electronic configuration of an element represented as 199X?
Classroom
Chemistry Classroom
Waec
Waec 1999
More Topics
What is the electronic configuration of an element represented as 19
9
X?
SchoolNGR Classroom
Take Free Practice Test On 2026 JAMB UTME, Post UTME, WAEC SSCE, GCE, NECO SSCE
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
Show Answer
Show Explanation
Correct Answer:
Option A
Explanation:
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