1.9 times 10^32 5.3 times 10^-33 6.6 times 10^-36 3.32 times 10^-36 3.02 times 1
ID: 1073736 • Letter: 1
Question
1.9 times 10^32 5.3 times 10^-33 6.6 times 10^-36 3.32 times 10^-36 3.02 times 10^45 What is the wavelength of a photon that has an energy of 4.38 times 10^-18 J? 45.4 nm 2.30 times 10^6 nm 6.89 times 10^14 nm 1.45 times 10^-17 nm 1.31 times 10^-10 nm Of the following, which element has the highest first ionization energy? Sr Rb Na Cl At Which isoelectronic series is correctly arranged in order of decreasing ionic radius? K^+ >Ca^2+ >S^2 rightarrow Cl^- S^2 rightarrow Cl^ rightarrow K^+>Ca^2+ Ca^2+>S^2 rightarrow K^+>Cl^- S^2 rightarrow Cl^ rightarrow Ca^2+>K^+ Ca^2+>K^+>Cl^ rightarrow S^2- The electron geometry and molecular geometry of iodine trichloride are _______and _________, respectively. trigonal bipyramidal, trigonal planar tetrahedral, trigonal pyramidal trigonal bipyramidal, T-shaped octahedral, trigonal planar T-shaped, trigonal planarExplanation / Answer
Chlorine has highest ionization energy because
Sr has IE of 550 Kj/mole
Rb -- 403 kj/mole
Na-----496Kj/mole
Cl ---- 1251Kj/mole
At ----890 Kj/mole
The following are the configuration of the atoms considered.
Cl = [Ne] 3s23p5
Na=[Ne]3s1
Mg=[Ne]3s2
Rb=[Kr]5s1
Sr= [Kr]5s2
At=[Xe]4f145d106s26p5
Reason:
Na (11) ,Mg(12) and Cl (17) are in the same row. IE generally increases from across period from left to right as the increasing nuclear charge on successive atoms more tightly binds the electrons being removed to the nucleus. Therefore Na has low IE than Mg. and Na and Mg has lower IE than Cl.
Na(11) and Rubidium (37) are in the Group1 .The IE decreases as we go down the group because the electron being removed is further from the nucleus(in higher energy level). Therefore Na has more IE than Rb.
From the above two statements we see that I.E of Rb is less than Na. Therefore ionization potential of Rb is less than Cl.
Mg(12) and Strontium (St) (38) are in the Group 2 .The IE decreases as we go down the group because the electron being removed is further from the nucleus(in higher energy level). Therefore Mg has more IE than St.
Since Mg has low IE than Cl, Therefore St has less IE than Cl.
Chlorine and astatine are in the same group(VIIA) I.E decreases as you go down the group because the electron being removed is further from the nucleus(in a high energy level). Therefore chlorine has highest I.E compared to At.
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