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Answer:c
Explanation:
A valley will be carved out due to erosion.
The third shell has 3 subshells: the subshell, which has 1 orbital with 2 electrons, the subshell, which has 3 orbitals with 6 electrons, and the subshell, which has 5 orbitals with 10 electrons, for a total of 9 orbitals and 18 electrons.
This is a combination reaction. Look at the 2 elements on left and a compound on the right.