SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They have similar chemical symbols
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They have the same atomic number
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They have similar chemical properties
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They have the same average atomic mass
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Detailed explanation-1: -Reason: Elements in a group have the same number of electrons in the outermost shell hence they have similar chemical properties.
Detailed explanation-2: -So, elements in the same group have similar chemical properties because they have the same number of electrons in their outer shell.
Detailed explanation-3: -Elements in the same column of the Periodic Table have the same number of valence electrons – that’s why they have similar chemical properties.
Detailed explanation-4: -The vertical columns (groups) of the periodic table are arranged such that all its elements have the same number of valence electrons. All elements within a certain group thus share similar properties.
Detailed explanation-5: -The elements of same group have similar chemical properties because they have same number of valence electrons. For eg: Li has 1 valence electron and so does NA, K and Cs.