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Compare the properties of the elements of group 1[IA] i.e. alkali metals and group 17 [VIIA] i.e., halogens.

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Answer

Below table shows the comparison of the elements of group 1[IA] i.e. alkali metals and group 17 [VIIA] i.e., halogens:

Property Group 1 [IA] Group 17 [VIIA]
Elements Li, Na, K, Rb, Cs, Fr F, Cl, Br, I, At
Valency Univalent (1 valence electron) Univalent (7 valence electrons)
Nature Highly reactive, highly electropositive, light soft metals Highly reactive, highly electronegative, non – metals
Conductivity Good conductors of heat and electricity Bad or non conductors of heat and electricity
Reducing / Oxidizing nature Strong reducing agents Strong oxidizing agents
Electronegativity Low electronegativity High electronegativity

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Periodic table

With reference to group 1 [IA] of the periodic table โ€“ fill in the blanks with the correct word:
The elements are …………… [light/heavy] …………… [metals/non metals] since their atomic size is …………… [large/small]. The energy binding the atoms is …………… [high/low] and hence the elements have …………… [high/low] melting points. The melting points of the elements …………… [increases/decreases] down the subgroup. The electropositive character …………… [increases/decreases] down the subgroup and the elements are strong …………… [reducing/oxidizing] agents. The element with electronic configuration 2, 8, 1 will have …………… [higher/lower] electron affinity and …………… [smaller/larger] atomic size than the element with electronic configuration 2, 1.

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In period 2, element ‘A’ is to the right of element ‘B’
(a) The element ‘A’ would probably have a …………… [smaller/larger] atomic size than ‘B’.
(b) The element ‘B’ would probably have …………… [lower/higher] ionization potential than ‘A’.
(c) The element ‘A’ would have …………… [lesser/higher] electron affinity than ‘B’.
(d) Nuclear charge of element ‘B’ would be …………… [less/more] than element ‘A’.
(e) If an element ‘C’ had a low electronegativity and ionization potential it would have more tendency to …………… [gain/lose] electrons.

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