NCERT Solution for Class 10 Science Chapter 5
Periodic Classification of Elements
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-90
Questions No- 4 Part-1
Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?
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Yes. The atoms of all the three elements lithium, sodium, and potassium have one
electron in their outermost shells.
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Lithium, Sodium and Potassium have following similarities:
(i) They all have valence electron equal to 1.
(ii) They all belong to same group, i.e. Group 1st in Periodic Table.
(iii) They all form ionic bond with non-metals.
(iv) They all are highly electropositive.
(v) They all are highly reactive.