how many valence electrons are there in magnesium (mg)?\n1\n2\n3\n4\n5\n6\n7\n8

Answer

Brief Explanations:

Magnesium has an atomic number of 12. Its electron - configuration is 1s²2s²2p⁶3s². The outermost shell (valence shell) is the third shell with 2 electrons.

Answer:

B. 2