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Fleming's Left Hand Rule

F, Cl, Br, I ...

Question

F, Cl, Br, I are the members of group 17 of the modern periodic table. How many valence electrons are present in fluorine and iodine?

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Solution

F, Cl, Br, and I are members of group 17 of the periodic table. Group 17 elements have seven valence electrons. Hence, fluorine and iodine have seven valence electrons.

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How many groups and periods are present in the modern periodic table?

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Q. (d) State the modern periodic law. How many groups and periods are present in modern periodic table ?

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Chlorine shows similarities in properties with bromine and iodine present in group 17(VII A) of the Modern Periodic Table.

Q. Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-aluminium, and eka-silicon.

(a) Name the element which has taken the place of (i) eka-aluminium, and (ii) eka-silicon
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