Metals and non-metals in the periodic table
2 marks · HardExplain why all elements in Group 2 of the periodic table react in a similar way. Your answer should refer to electronic structure.
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Also accept: They all have 2 electrons in their outer shell so react similarly.; Group 2 elements have the same number of electrons in their outer shell, which determines similar chemical properties.
Common mistakes: Saying they are in the same period instead of group; Referring to atomic number instead of outer electrons
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Marking points
M1 · 1 mark · States or implies that all Group 2 elements have the same number of electrons in their outer shell.
M2 · 1 mark · Links the similarity in outer electrons to similar chemical reactions/properties.
Worked solution
All Group 2 elements have 2 electrons in their outer shell.
Because chemical reactions depend on the number of outer electrons, they react in a similar way.