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1) List the number of protons, neutrons, and electrons in Carbon-13.

2) A fictitious element X is composed of 10.0 percent of the isotope X-55, 20.0 percent of the isotope X-56, and 70.0 percent of the isotope X-57. Calculate the weighted atomic mass of element X to the nearest tenth.

Please help with both questions and show all work!

Answer :

aftarahmadsami
1) Carbon-13: 
                      Proton-6     Neutron-7       Electron-6

2)Atomic mass of element X:
   (55*10+56*20+57*70)/100=56.6

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