How many valence electrons are in an atom of magnesium? (atomic number 12)?

From the periodic table, Magnesium is actually the element 12 and this belongs to Group 2. We know that an element in Group 2 has 2 valence electrons.

We can also determine this from the electron configuration of Mg which is 1s² 2s²2p⁶ 3s² or [Ne]3s². Since the outermost electron is 3s² therefore magnesium has 2 valence electrons.

to make a supersaturated solution, make a saturated solution of sugar by adding 360 grams of sugar to 100 ml of water at 80 degrees celsius. when the water cools back down to 25 degrees, that 360 grams of sugar will still be dissolved even though the water should only dissolve 210 grams of sugar.

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