An isotope of an element contains 12 protons and 14 neutrons. a. What is the ato

Question

An isotope of an element contains 12 protons and 14 neutrons. a. What is the atomic number?_____ b what is the identity of the element?_____ c. what is the mass number?_____ Complete the following table (it is permissible to use the noble gas short-cut): An element has four stable isotopes with the following masses and abundances: (SHOW ALL CALCULATIONS) Calculate the Atomic Mass of the element from the given data above. used on your answer for question-a, what is the identity of the element? X-ray has a wavelength of 0.25 nm. What is the frequency, v, of the X-ray? How much energy does this X-ray have?

Explanation / Answer

6. a.atomic number = 12

    b. element             = Mg

c. atomic mass A = n + P

                                  = 12 + 14 = 26

Si = 14 1s22s22p63s23p2

Ge   = 32 1s22s22p63s23p63d104s24p2

Bi    = 83 1s22s22p63s23p64s24p64d10 5s25p64f145d106s26p3

averge atomic mass = 53.9396*0.0585 + 55.9349*0.9175 +56.9354*0.0212 +57.9333*0.0028 = 55.84

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