Answer :
Answers and Explanation:
b) Complete electron configuration of Se:
1 s² 2 s²p⁶ 3 s²p⁶ 4 s²p⁴
Se has 4 energy levels, with an incomplete 4th level (they are necessary 2 electrons to complete p orbital in the 4th level).
c) The first ionization energy of Se
i) is less that of bromine (Br) because the first ionization energy increases from left to right in a period in the Periodic Table. Se and Br are in the same period, and Se is located to the left of Br so Se has lesser ionization energy than Br.
ii) is greater than that of tellurium (Te) because the first ionization energy decreases from top to bottom in a group in the Periodic Table. Se and Te are in the same group, and Se is at the top of Te. Hence, Se has a greater first ionization energy than Te.
Complete electron configuration of Selenium is [tex]\rm 1s^2\;2s^2\;2\;p^6\;3\;s^2\;3\;p^6\;4\;s^2\;4\;p^4[/tex]
The first ionization energy of selenium is less than that of bromine as
Se and Br belong to same period.
The first ionization energy of selenium greater than that of tellurium as
Se and Te belong to same group.
Se has been a nonmetal with atomic number 34.
b. The complete electron configuration of Selenium has been given as:
[tex]\rm 1s^2\;2s^2\;2\;p^6\;3\;s^2\;3\;p^6\;4\;s^2\;4\;p^4[/tex]
The number of unpaired electrons in the ground state has been 2, as p sub shell occupies 6 electrons. The presence of 4 electrons made 2 unpaired electrons available.
c. The first ionization energy has been the amount of energy required to remove an electron form the ground state of the atom. In the periodic table on moving down the group there has been an decrease in the first ionization energy with the decrease in nuclear attraction on the outer most shell.
On moving from left to right, there has been an increase in first ionization energy with the increase in attraction force due to the increase electron in a shell.
- Se and Br belong to same period. Since Br is located right to Se, Se has lesser ionization energy than Br.
- Se and Te belong to same group. With Te present below Se, it has lesser ionization energy than Se.
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