SELECT * FROM question_mgmt as q WHERE id=3614 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=9 AND subId=16 AND chapterId=256 and ex_no='3' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 10th science Periodic Classification of Element a lithium sodium potassium are all metals that

Question:

(a) Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?
(b) Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?

Answer:

(a) Yes. All these elements have one valence electron in its outermost shells.

(b) Helium and Neon are inert noble gases. They are least reactive elements because of completely filled valence electrons. Helium has completely filled the K shell with 2 electrons whereas neon has completely filled L Shell with B electron.


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