SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Transition metals and Noble Gases
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Alkaline Earth Metals and Nitrogen family
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Alkali Metals and Halogens
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The Rare Earth metals and Oxygen family
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Detailed explanation-1: -The two most reactive families of elements are the halogens and the alkali metals. How do they differ in their reactivities? The ionic compounds can be formed by alkali metals whereas both ionic and covalent compounds can be formed by Halogens.
Detailed explanation-2: -Group 1A (or IA) of the periodic table are the alkali metals: hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). These are (except for hydrogen) soft, shiny, low-melting, highly reactive metals, which tarnish when exposed to air.
Detailed explanation-3: -As a general rule, fluorine is the most reactive halogen and astatine is the least reactive. All halogens form Group 1 salts with similar properties.