ICSE Class 10 Chemistry
Question 20 of 25
Periodic Table, Periodic Properties and Variations of Properties — Question 19
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Question Explain why are the following statements not correct:
(i) All groups contain metals and non-metals.
(ii) Atoms of elements in the same group have the same number of electron(s).
(iii) Non-metallic character decreases across a period with increase in atomic number.
(iv) Reactivity increases with atomic number in a group as well as in a period.
(i) Incorrect — A few groups contain metalloids and inert gases also.
(ii) Incorrect — as we move down the group the number of electrons increases.
(iii) Incorrect — Non-metallic character increases across a period with increase in atomic number.
(iv) Incorrect — Chemical reactivity in metals increases on going down the group, but in non-metals decreases on going down the group.