18) Which of the following elements is a halogen? 18) B) Kr D) Sn E) Po 19) Iden

Question

18) Which of the following elements is a halogen? 18) B) Kr D) Sn E) Po 19) Identify the instrument that is used to determine the mass of a molecule. 19) A) nuclear magnetic resonance spectrometer B) infrared spectrometer C) mass spectrometer D) ultraviolet spectrophotometer E) gas chromatograplh 20) An atom of 13c contains protons. 20) B) 19 C) 13 21) Calculate the atomic mass of element "X, if it has 2 naturally occurring isotopes with the following 1 21) and natural abundances X-45 X-47 44.8776 amu 46.9443 amu 32.88% 67.12% A) 46.34 amu B) 46.84 amiu C) 45.91 amu D 44.99 amu E) 4626 amu 22) Predict the charge that an ion formed from tellerium would have. 22) 23) Which of the following is an example of the law of multiple proportions? 23) A) Two different compounds formed from carbon and oxygen have the following mass ratios: 1.33 g 0:1g C and 2.66 g 0:1g C B) A sample of chlorine is found to contain three times as much Cl-35 as CI-37 C) Two different samples of table salt are found to have the same ratio of sodium to chlorine. D) Nitrogen dioxide always has a mass ratio of 2.28 g 0:1gN E) The atomic mass of bromine is found to be 79.90 amu. 24) How many electrons are in a neutral atom of chlorine-37? 24) A) 17 B) 1 C) 37 D) 18 25) How many moles of Cs are contained in 595 kg of Cs? 25) A) 7.91 x 104 moles Cs B) 223 x 102 moles Cs c) 5.39 x 102 moles Cs D) 4.48 x 103 moles Cs E) 1.26 x 103 moles Cs 26) Which of the following elements is classified as a metalloid? 26) A) germanium B) iodine C) calcium D) sodium

Explanation / Answer

18. Option C, Iodine is a halogen

19. Option A, Mass Spectrometer

20. Option A, 6 since no of protons are equal to the atomic no of an element. Atomic no of Carbon is 6, hence no of protons are 6.

22. Option A, since Te belongs to oxygen family and it's most stable ionic form is Te2-

23. Option A, since a/c to law of multiple proportions, the weightscof one element that combine with a fixed weight of the other are in a ratio of small whole numbers

24. Option A, 17 since no of Electrons in neutral atom are Equal to the atomic number

25. No of moles = Mass in gramst/ Molar mass, 595000/ 12= 49.5x 103 moles

26. Option A, Ge- Metalloid is the one which has both metal and non metal properties.

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