Please explain answers 2. Which would you expect to experience a greater effecti

Question

Please explain answers 2. Which would you expect to experience a greater effective nuclear charge, a 2p electron of a Ne atom or a 3s electron of a Na atom? a. 2p electron of a Ne atom b. 3s electron of a Na atom c. Both experience the same effective nuclear charge d. Requires a table of shiclding constants to make an estimation 3. Calculate the valuc of Zem for Si and CI by assuming core electron contribute 1.00 and valence electron contribute 0 to the screening constant. Based on your calculation results, in the same period, from left to right, Zet a. Zetf (Si) 14, Zetr (CI) 17. In the same period, from left to right, Zett increases. b. Zeer (Si)-4, Zeff (CI) = 7. In the same period, from left to right. Zeir increases. c. Zem(Si) _ +4, (CI)--I . In the same period, from left to right. Zer decreases. d. Z (Si)-0, Zr(CI)-. In the same period, from left to right, Ze decreases Which willexperience the greater effective nuclear charge, the electrons in the i -3 shell in Ar or the n-3 shell in Kr? Which will be more closer to the nucleus? a. the n-3 shell in Ar, which will be more closer to the nucleus. b. the n-3 shell in Kr, which will be more closer to the nucleus. c. the n-3 shell in Ar, which will be less close to the nucleus. d. the n-3 shell in Kr, which will be less close to the nucleus. 5. Which of the following is not correct in terms of their sizes? 6. Arrange Na, Be and Mg in order of increasing atomic radius. c.Be

Explanation / Answer

Q3.

Zeff goes from bottom to top, and left to right

Therefore

Si < Cl

since they are in the SAME row, that is, period, then the trend geos from left to right increasingly

from the lsit, choose B

Question 6.

Na , Be nad Mg are in the left side of the periodic table

Be = 3, Na = 11, Mg = 12

then, the largest must be Na, since it is Group Ia metal

then Be < Mg, since Mg is on the same gropu as Be, but has larger atomic number

choose

Be < Mg < Na

Q7

radius depends on the charge of the atom

Mg2+ < Ca2+

and

Ca > Ca2+, when an atom gets positive charge, it decreases, due to proton attraction

then

Mg2+ < Ca2+ < Ca

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