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Arisa [49]
3 years ago
9

rank the group 1a elements tested in order of increasing energy emission when electrons returns to the ground state. explain thi

s pattern in terms of changes in energy levels.
Chemistry
1 answer:
labwork [276]3 years ago
3 0

<em>Answer:</em>

  • The increasing order of energy emission is as follow
  •                               Li < Na < K < Rb < Cs

<em>Explanation:</em>

  • The Characteristic colors of alkali metals are
  •                   Li-crimson<em> red</em>
  •                   Na- golden<em> yellow</em>
  •                    K- pale <em>violet</em>
  •                    Rb and Cs- <em>violet</em>
  1. These flame color show that when we moved from down the group, the wavelength decreases (frequency increases).
  2. As the color of Li is red that shows ,it has less emission energy as compare to Rb and Cs that have color violet (more emission energy).
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The given chemical reaction is,

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According to the Hess’s law, if we reverse the reaction then the sign of \Delta H change.

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<u>Answer:</u>

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