Valence electron is the number of electrons in the outermost energy level of an atom. Which of the following pairs of elements and valence electrons is incorrect?
A. Al - 3
B. Br - 7
C. S - 4
D. Sr - 2
A. Al - 3
B. Br - 7
C. S - 4
D. Sr - 2
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Answer:
D. letter
Explanation:
im not sure
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