Question: Please answer both!! 19. The element boron (B) has two isotopes: B-10 (10.013 amu) with 19.9% natural abundance and B-11 with 80.1% natural abundance. The

Please answer both!!

19. The element boron (B) has two isotopes: B-10 (10.013 amu) with 19.9% natural abundance and B-11 with 80.1% natural abundance. The average atomic mass of boron is 10.811amu. What is the mass of the B-11 isotope? A. 10.412amu B. 11.609amu C. 11.009amu D. 10.500amu E. 21.000amu 20. Which of the following statements is consistent with Rutherford's findings? A. Protons and neutrons are positively charged B. An atom is made up mainly of empty space C. A magnetic field separates particles based on their charge D. Electrons are heavier than protons E. Electrons are negatively charged

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