SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the same number of valance electrons
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the same number of total electrons
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the same number of protons
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different physical and chemical properties
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Detailed explanation-1: -The valency of an element is determined by the number of valence electrons present in the outermost shell of an atom. The electronic configuration of the outermost shell is same for all the elements belonging to the same group. So, the number of valence electrons for all the elements in a group is the same.
Detailed explanation-2: -All elements in a group have the same number of valence electrons equal to the first digit of their group number.
Detailed explanation-3: -The number of the valence electrons present in an element is reflected by its position in the periodic table. In a given period number of electrons in a valence shell increases from left to right. Whereas in a group, the number of valence electrons remains the same from top to bottom.
Detailed explanation-4: -Explanation: The group number is the same as the number of the valence electrons each element within that group has. Therefore, two elements in the same group will have the same number of valence electrons.