A student studying chemistry in Guyana draws the electron configuration of a magnesium atom (atomic number 12). The correct electron arrangement for magnesium is

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Question

A student studying chemistry in Guyana draws the electron configuration of a magnesium atom (atomic number 12). The correct electron arrangement for magnesium is

Accepted Answer

2, 8, 2 — Award 1 mark for the correct electron configuration. The first shell holds maximum 2 electrons, the second shell holds maximum 8 electrons, and the remaining 2 electrons go in the third shell. A is incorrect — the second shell cannot hold 10 electrons (maximum is 8). C is incorrect — this does not follow the filling rules. D is incorrect — the first shell can only hold 2 electrons, not 6.

Answer

2, 10

Answer

6, 6

Answer

2, 8, 2

Answer

2, 4, 6

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