This is a multiple choice4 examination. For each question there are 5 choice. Se

Question

This is a multiple choice4 examination. For each question there are 5 choice. Select the single choice that best answers each question, then pencil in your choice on the answer sheet using a no. 2 pencil. If you have to erase do so nearly. Avogadro's Number N = 6.023 times 10^23; R = 0.08206 L-atm (vol. K). Two atoms are isotopes if they have the same. (a) mass number, but different atomic number (b) number of electrons, protons, and neutrons (c) number of neutrons, but a different no of process (d) number of process, but a different number of neutrons (e) none of these An atomic particle having 30 protons, 35 newtons, and 28 electrons has (a) a charge of +2 (b) as atomic no. of 35 (c) a mass no. of 30 (d) An atomic no 28 (e) none of these The number of neutrons in Br-80 is: (a) 115 (b) 80 (c) 45 (d) 35 (e) none of these The correct name for K_2SO_4 in: (a) potassium sulfate (b) dipotassium sulfate (e) potassium sulfate (d) potassium oxide sulfate (e) none of these The correct name for N_2O_5 is: (a) nitric oxide (b) nitrogen pentoxide (c) dinitrogen pentoxide (d) nitrous oxide (e) none of these The formula for calcium nitrate is: (a) Ca(NO_3)_2 (b) CaNO_3 (c) Ca_3(NO_3)_2 (d) Ca_2NO_3 (e) none of these The chemical properties of an element are primarily dependent upon: a) The electronic of the element (b) The number of principal (main) of the element (e) none of these

Explanation / Answer

Ans 1. d . number of protons , but a different number of neutrons

Isotopes are the atoms having the same atomic number but different mass numbers . They are the radioactive forms of an element , which have the same number of electrons and protons that govern their major properties , but possess different number of neutrons in their nuclei.

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