An element X has atomic number 3, relative atomic mass 6.94 and consist of twoisotopes of mass numbers 6 and 7. What is the mass number of the more abundantisotope of X? Give a reason for youranswer.

A hypothetical element X has two naturally occurring isotopes:  A with an isotopic mass of 64.531 and B with an isotopic mass of 62.126.  If the element X has an atomic mass of 63.092, what is the percent abundance of isotope A?

An unknown element, Z, has 3 isotopes: Z5, Z6 and Z8. Given that the atomic mass of Z is 7, and the relative abundance of Z5 is 20%, which of the following statements are correct? 1. Z5 and Z6 are present in the same abundance. 2. Z8 is the most abundant of the isotopes. 3. Z8 is more abundant than Z5 and Z6combined. A. 1 only B. 2 only C. 3 only D. 1 and 3 E. 1, 2 and 3

The isotopic masses (amu) and % abundances of the isotopes are given below. Isotope Abundance (%) Mass (amu)159X 30.60 159.37163X 15.79 162.79164X  53.61 163.92 The average atomic mass of the element is __________ amu.Question 1Select one:a.161.75b.162.03c.162.35d.163.15e.33.33

An element X has four naturally occurring isotopes, with natural abundances and masses outlined in the table below. Mass (a.m.u) Natural Abundance (%)11.00 40.70 %13.00 39.30 %14.00 15.60 %16.00 4.40 %Calculate the atomic mass of element X, to two decimal places.

An atom has a mass number of 9 and 5 neutrons. What is its atomic number?A.11B.14C.4D.19SUBMITarrow_backPREVIOUS