Why does Na have a larger atomic radius than Mg? Na has more electrons than Mg.

Question

Why does Na have a larger atomic radius than Mg? Na has more electrons than Mg. Mg has more electrons than Na. Mg has more protons and a higher effective nuclear charge than Na. Na has more shells than Mg so the valence electrons have a large principal quantum number. Which has the smallest iconic radius? Mg^2+ Ga^3- Ca^2+ Al^2+ This orbital diagram represents the correct valence shell ground state for Cr^2+ Fe^2+ Mn V. Which is the best Lewis structure for nitrogen monoxide? N=0: N=O: N=O: N=O: How many lone electrons does the Lewis structure of nitrogen trifluoride, NF_3 contain? 1 4 9 10 What is the formal charge on nitrogen in the nitrate ion? +1 0 -1 -3 Which does NOT contain predominantly covalent bonds? HCL KCL HN0_3 KN0_3 Which does NOT have a tetrahedral molecular CF_4 SeF_4 SiF_4 PF_4+ A central atom has one lone pair and three single bonds. What is the molecular geometry? Bent tetrahedral trigonal planar trigonal pyramidal According to the VSEPR method, what are the approximate values of the bond angles X and Y? X is 90 degree and Y is 180 degree X is 90 degree and Y is 120 degree X is 109.5 degree and Y is 180 degree X is 109.5 degree and Y is 120 degree Which could be a description of a pi(x) bond? The overlap of two 1s atomic orbitals the overlap of two 2p atomic orbitals the overlap of two Sp^3 hybrid orbitals the overlap of a sp^3 hybrid orbitals with a 1s atomic orbital How many sigma and pi bonds are in one molecule of benzoic acid? 11 sigma, 4 pi 11 sigma, 8 pi 15 sigma, 4 pi 15 sigma, 8 pi The molecular orbital energy diagram for He_2^2+ is shown, what is the bond order of He_2^2+? 0 1/2 1 2 What are the polarities of the indicated molecules? Pf_3 pF_5 polar non polar polar polar non polar non polar nonpolar nonpolar Which molecule is non polar but contains polar bonds? CO_2 So_2 O_2 CH_2Cl_2

Explanation / Answer

53.C

Mg has more nuclear charge than Na

54. D Al+3

when positive charge increases on cation nuclear attraction increases on the valency electrons and it has smaller size.

55. B Fe+3

56. C

57. D

In NF3   N has one lone pair and F has 3 lone pairs. Total 10 lone pairs

58. A +1

formal charge on N = 5-0-1/2*8 = +1

59.B

in Kcl is ionic bond

60. B

61. D trigonal pyramidal

62. D

single bond carbon involve Sp3 hybridisation bond angle is 109.5 and double bond carbon involve Sp2 hybridisation bond angle is 120

63. B

64.C

65. C

66. A

67. A

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