A.1

B.2

C.3

D.4

Aluminium is the element with atomic number 13 and atomic weight 29.8. It has 13 electrons with K,L, M shells with K shell having 2 electrons, L shell with 8 electrons and M shell with 3 electrons revolving around the nucleas. M shell is the valency shell with 3 valence electrons. The atom will have three shells with electrons.

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Answer:

C.3 po c po c po c poc

Explanation:

C.3 po c po c