23.of the choices below, which gives the order for first ionization energies? a.
ID: 562193 • Letter: 2
Question
23.of the choices below, which gives the order for first ionization energies? a. CI> S> Al Ar >Si b. Ar> CI> SSi> Al c. Al> Si s>CI>Ar d. CI> S Al Si>Ar e. S>Si> CI> AI Ar 24. Which equation correctly represents the first ionization of aluminum? a. Arg) Al (g) + b, Al (g) Ar (g) + e. c, Al (g) + e- Al-(g) d. Al(g) Al+(g) + e- e. Al(g) + e-Al(g) + 25.Of the following elements, has the most negative electron affinity. a. Na b. Li c. Be d. N e. F 26.Of the elements below is the most metallic. a. sodium b. bariunm c. magnesium d. calcium e. cesium .In the generation of most anions, the energy change (KJ/mol) that_ an electron is a. removes, positive b. adds, positive c. removes, negative d. adds, negative e. None of the above is correct. 28. Which of the following has eight valence electrons? a. Ca2+ b. Kr c. CI d. Nat e. all of the aboveExplanation / Answer
23. The correct answer is option 'b', while moving from left to right in a period ionisation energy generally increases due to decrease in size
24. Equation 'd' represents the first ionisation of aluminium, because during first ionisation gaseous aluminium loses one electron and forms a positively charged Aluminium ion.
Hence option 'd' is correct.
25. Out of all the given elements Flourine has the most negative electron affinity, due to its small size and high effective nuclear charge.
Hence option 'e' is correct.
26. Cesium is most metallic , because as we go down the group mettalic nature of elements increases. Option 'e' is correct.
27. In generation of most anions the energy change that adds an electron is negative, because energy is released in the process.
Hence option 'd' is correct.
28. All the given ions Ca2+, Kr, Cl- , and Na+ has 8 valence electrons.
Hence the correct option is 'e'
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