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Which of the listed properties is the same for the elements beryllium (Be), magnesium (Mg), and calcium (Ca)?


reactivity
atomic radii
number of energy levels
number of valence electrons

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meetpatel0719
Answer is valence electron, they all have total of 2 valence electron.
remember group number = valence electron

Answer: The correct answer is number of valence electrons.

Explanation:

Elements are distributed into 7 Periods and 18 groups in periodic table.

Elements that belong to same group show similar chemical properties because they have same number of valence electrons.

Beryllium belongs to Group 2 and period 2 of the periodic table.

Magnesium belongs to Group 2 and period 3 of the periodic table.

Calcium belongs to Group 2 and period 4 of the periodic table.

Hence, the correct answer is number of valence electrons.

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