The common property amongst Be, Mg, Ca, Sr, Ba and Ra in the modern periodic table is:
A
equal number of electrons
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B
equal number of electrons in the valence shell
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C
same number of shells
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D
all of the above
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Solution
The correct option is B equal number of electrons in the valence shell The elements in the modern periodic table are arranged in 18 vertical columns called groups and 7 horizontal rows called periods. Be, Mg, Ca, Sr, Ba and Ra belong to group-II of the modern periodic table. In the modern periodic table, all the elements of the same group have the same number of valence electrons.