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

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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explanation:

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

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(jacemorris04)