explain giving justifications the trends in following properties of elements on moving left to right in a period, in the modern periodic table. 1. variation of valancy 2. change in atomic radius 3. metallic to non metallic character?
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On moving from left to right in a period, the number of valence electrons increases from 1 to 8. On moving from left to right in a period, the atomic size decreases; the size of the atoms decreases. ... The elements fluorine and chlorine have seven electrons in their outer shell. They are very reactive.
2) In third period of the Periodic Table; at first the valancy increases and then decreases. This happens with nearly all the periodsexcept period no.1. This is because when we move from left to right in a period, the atomic no. increases which increases the valence
3) The atomic size increases from the top to the bottom in any group as a result of increases in all of the three factors. (As the number of energy levels increases, the size must increase.) Going across a period (from left to right), the number of protons increases and therefore the nuclear charge increases.
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Aman
2) In third period of the Periodic Table; at first the valancy increases and then decreases. This happens with nearly all the periodsexcept period no.1. This is because when we move from left to right in a period, the atomic no. increases which increases the valence
3) The atomic size increases from the top to the bottom in any group as a result of increases in all of the three factors. (As the number of energy levels increases, the size must increase.) Going across a period (from left to right), the number of protons increases and therefore the nuclear charge increases.
#___hope__this___will___help__you__
Aman
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