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P-1 Periodic Classification of Element — Science STD 10 — Question

Maharashtra BoardEnglish MediumSTD 10ScienceP-1 Periodic Classification of Element2 Marks
Question
Alkali metals are placed in Group 1.
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Answer

(i) The group number indicates the number of valence electrons present in the outermost shell of an atom of an element.
(ii) All alkali metals have one electron in their outermost shell. Hence, they are placed in Group 1.

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