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Q1.
Three elements in Group 2 of the periodic table are beryllium (Be), magnesium (Mg) and calcium (Ca). Their mass numbers and proton numbers are shown below. The electronic structure is shown for beryllium and calcium.

(b) • The three elements have similar chemical properties
• The reactivity of these elements with non-metals, increases from beryllium to magnesium to calcium.
Explain these two statements in terms of atomic structure.
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