Please help 40. Rutherford directed alpha particles at a thin gold foil. He obse

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40. Rutherford directed alpha particles at a thin gold foil. He observed that only a few particles were sharply deflected. How did he interpret this observation? 48. Whic (A) Electrons can have only specific quantized energies. (B) All protons in an atom are concentrated in a (C) Electrons move in circular orbits within the atom. (D) Atoms have isotopes with different relatively small volume. 49. Base masses and numbers of neutrons. 41. How many protons, neutrons and electrons are in a "Na cation? 50. Wh (B) 11 (C) 11 (D) 12 1I 12 12 10 12 10 12 (A (B 42. How many unpaired electrons does a cobalt (Co) atom have in the ground state? (A) 7 (B) 5 (D)I 51. W st 43. Which is the formula of a stable compound? (A) AIF (B)SrCI (C) KS, (D) Bas Which of these elements has the highest electronegativity? (A) Li 44. (B) N (C) K (D) As The valence electron configuration of element A is n and that of element X is nsnp. What is the formula of the most stable compound formed between elements A and X? 45· 52. (A) AX (B) AX (C) AX (D) AX Which element is most stable as a diatomic molecule? (A) neon (C) bromine 46. (B) iron (D) silicon 47. Which comparison of sulfur with a neighboring element 53. is true? (A) S has a higher electronegativity than Cl (B) S has a lower electronegativity than P. (C) S has a lower ionization energy than O. (D) S has a lower ionization energy than Se. 54

Explanation / Answer

40 )

Ans= B) all protons are concentrated in a relatively small volume

41)

Ans= A)

42)

Ans= C) 3

43)

Ans= D) BaS

44)

Ans= B) N

45)

Ans= B) AX2

46)

Ans=C) Br2

47)

Ans= C) S has lower ionisation energy than O

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