SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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beryllium (Be)
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calcium (Ca)
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strontium (Sr)
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radium (Ra)
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Detailed explanation-1: -Francium is most reactive element in periodic table.
Detailed explanation-2: -Answer: Cesium is the most reactive element since it is the second from the bottom of this group, has six electron shells, and exhibits the characteristics of a reactive atom.
Detailed explanation-3: -Radium is the heaviest and most reactive element of the alkaline earth metals family. Radium is rare because of its high reactivity and short half-life. It is a part of the group of elements that appears after bismuth (Z=83) which are all radioactive and unstable.
Detailed explanation-4: -The two most reactive groups of elements are the alkali metals and the halogens, because of their valence electrons.
Detailed explanation-5: -Xe. Out of He, Ar, Kr and Xn, Xn is most reactive chemically.