SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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because they originated from the same common element
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because they share electrons
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because they have the same total number of electrons
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because the valence is equal
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Detailed explanation-1: -The physical and chemical properties of elements depend on the number of valence electrons. Elements present in the same group have the same number of valence electrons. Therefore, elements present in the same group have similar physical and chemical properties.
Detailed explanation-2: -Reason: Elements in a group have the same number of electrons in the outermost shell hence they have similar chemical properties.
Detailed explanation-3: -Valency of an element determines its chemical reactivity. Therefore, for all elements belonging to a particular group in the periodic table, the number of electrons in the outermost shell, that is the valence electrons will be the same.
Detailed explanation-4: -Two different elements are likely to have similar chemical properties when they have the same number of valence electrons. Elements with the same number of valence electrons are found in the same column of the Periodic Table. Elements with the same valence shell are found in the same row on the Periodic Table.
Detailed explanation-5: -Summary. The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.