Question

YEN 18. The electron configuration 18-2-2p 3s 3p applies to all of the following species except ACI B. Ar C. Ca2+ D. Na Ε Κ 19. Rank the following elements in order of increasing atomic size: Ge, Rb, S, Ne A Ge<Rb Ne <S B. Rb<S<Ne <Ge C. S < Ne < Ge<Rb D. Ne <S<GeRb E Rb <e <Ne <S 20. Select the pair that has the larger atom or ion listed first. A Ca?. Ca B CI, CE C. Rb, Sr D. Br, Se? E Br. Br 21. Which of the following compounds is likely to have covalent bonds? A. NaCl B. LiF CCO D. CaBr2 E. MgO 22. Arrange the following bonds in order of increasing polarity: CI-S, CI-P, Cl-Si, CI-CI A. CI-S<CI-P<CI-Si<CI-CI B. CI-S<CI-Si <CI-P<CI-CI C. CI-Si<CI-S<CI-CI <CI-P D. CI-CI <CI-S <CI-P<CI-Si E CI-CI <CI-P <CI-Si<CI-S 23. The correctly drawn Lewis formula for CBra will have A. 4 single bonds B. 5 single bonds C. 4 single bonds and 1 pair of nonbonding electrons on the carbon atom D. 4 single bonds and 2 pairs of nonbonding electrons on the carbon atom E. 4 single bonds and 3 pairs of nonbonding electrons on the carbon atom 24. The correctly drawn Lewis formula for HCN will have A. 2 single bonds and 5 pairs of nonbonding electrons B 1 single bond, I double bond, and 3 pairs of nonbonding electrons C. 2 double bonds and 2 pairs of nonbonding electrons D. 1 single bond, I triple bond, and 1 pair of nonbonding electrons

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Answer 1

Solution=

solution : 18. Le 26 26 1s 2s 2p 3s 3p Atomic no = 18 sinu atomin no. of Are is 18 configuration is 13² 2 2p 35 spo , so electronic co has total electrem is 18. cart has total electreon is 18 Kt has total electron is 18 Nat has total electron is 10 So wat con't be reepresented by above electronic configuration. 6 Ge, Rb, S, Ne Ne is and furios s is 3rd period element, so it has element, so it is least size. and (second) least size