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What is the electronic configuration of an elem... - WAEC Chemistry 1999 Question

What is the electronic configuration of an element represented as 199X?
A
1s 22s2 2p 5
B
1s22s23s23p3
C
1s2 2s2 2p 33s2
D
1s 22s22p 63s23p64s 1
correct option: a
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