An element X has 3 shells. Last shell contains 7 electrons. Find the :
a) Name the shells does it have.
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Answer:
....... it's the answer......
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0
Answer:
Hydrogen 1 1
2 Helium 2 18
3 Lithium 2, 1 1
Explanation:
a) Three elements that have a single electron in their outermost shells. ... (b) Helium and neon have completely filled outermost shell. Q12. ... An atom has electronic configuration 2, 8, 7.1
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