Chemistry

Give reason — Halogens in group 17 are strong oxidising agents.

Periodic Table

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Answer

Halogens have seven valence electrons and therefore need only one additional electron to attain a stable octet. Their very high electron affinity and electronegativity make them readily accept an electron from other substances, so they act as powerful oxidising agents.

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Complete the definitions of the periodic properties given below :
(a) Atomic size - the distance between —
(b) Ionisation potential - the amount of energy required —
(c) Electron affinity - the amount of energy released —
(d) Electronegativity - the tendency of an atom to attract —
(e) Metallic character - of an element is exhibited when an atom of the element loses —

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Chemistry

Give reason — Halogens in group 17 are strong oxidising agents.

Periodic Table

Answer

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Give reason — Atomic radii is considered a periodic property, exhibiting periodicity.

(a) Atomic size	- the distance between	—
(b) Ionisation potential	- the amount of energy required	—
(c) Electron affinity	- the amount of energy released	—
(d) Electronegativity	- the tendency of an atom to attract	—
(e) Metallic character	- of an element is exhibited when an atom of the element loses	—