Select the single best answer. For this pair of elements (F and Se), predict which one has more stable isotopes. Se O F

1- For each of the following atoms, calculate the number of protons and neutrons in the nucleus and the number of electrons outside the nucleus (assume neutral atoms). element number of number of number of electrons mass number (A) symbol 126C protons (Z) neutrons 12 10 12 10 14 27 10 23,1Na 11 17 18 2- Calculate the atomic mass to four significant figures for carbon, given the following data: Isotope Exact Atomic Mass (amu) 12.00000 13.00335 Abundance in Nature (%) 98.89 1.110 12C 13C

Calculated the weighted average of a substance from space. It has an abundance of 30.0% and 70.0% for its two isotopes. The atomic mass for the two isotopes are 111.653amu and 113.665amu, respectively.

Which of the following represents a pair of isotopes? Atomic Number | Mass Number 1. 6| 14 A II. 7| 14 1. 617 B II. 14 | 14 1. 6| 14 II. 14 | 28 I. 7 | 13 D II. 7 | 14 1. 8 10 II. 16 20

Calculate the atomic mass of each of the isotopes listed below. Give your answer in grams (g). The values will include the mass of Z electrons. Use 1 u = 1.6605 X 10-24 g. 1) Calculate the atomic mass of the isotopes 1H in grams (g). The atomic mass m1H = 1.007825 u. (Express your answer to five significant figures.) 2) Calculate the atomic mass of the isotopes 4He in grams (g). The atomic mass m4He = 4.002602 u. (Express your answer to five significant figures.) 3) Calculate the atomic mass of the isotopes 12C in grams (g). The atomic mass m12C = 12.000000 u. (Express your answer to five significant figures.) 4) Calculate the atomic mass of the isotopes 56Fe in grams (g). The atomic mass m56Fe = 55.934940 u. (Express your answer to five significant figures.) 5) Calculate the atomic mass of the isotopes 238U in grams (g). The atomic mass m238U = 238.050784 u. (Express your answer to five significant figures.)

The atomic number indicates_ the total number of neutrons and protons in a nucleus the number of different isotopes of an element the number of neutrons in a nucleus O the number of atoms in 1 g of an element the number of protons or electrons in a neutral atom

Copper has two naturally occurring isotopes: 69.17% of Cu-63 (mass 62.93 amu) and 30.83% of Cu-65 (mass 64.93 amu). Calculate the average atomic mass of copper.

Consider the elements Co-60 and Ni-60. a) How many neutrons and protons does each element have? b) Are these elements isotopes, isotones, isobars or isomers? c) Are the chemical properties of these two elements similar? Why or why not?