e terms atomic number, mass number, and atomic mass. Then, (ii) explain what isotopes are and (iii) identify which of these quantities – atomic number, mass number, and atomic mass – differ between isotopes

An unmanned space shuttle mission brings samples back to Earth from Mars.  Working with samples from mars, you discover that the isotope abundances on Mars are different from on Earth.  You are tasked with calculating the average atomic mass (weight) of nitrogen that exists naturally on Mars.  You find that the abundance of nitrogen-15 (atomic mass of  15.000 amu) on Mars is 11.639%, and the rest of the nitrogen (abundance = 100% - 11.639%) is nitrogen-14 (atomic mass 14.003 amu).  Using that information, what is the average atomic mass (in amu) of nitrogen on Mars? (answer should have 3 decimal places - only input numbers, not "amu")

Part 1 As seen on the periodic table, the element silicon (Si) has an atomic mass of 28.086 amu. This element is composed of three naturally-occurring isotopes. The first isotope, silicon-28, has a mass of 27.977 amu and a natural abundance of 92.229%. The second isotope, silicon-30, has a mass of 29.974 amu and a natural abundance of 3.087%. What is the mass (in amu) of silicon's third isotope? write your final answer (with the correct significant figures) Part 2 Based on the answer for part 1, the name of the third isotope of silicon is ___. An atom of that particular isotope contains___ protons and ____ neutrons.

Chromium which has an average atomic mass of 51.9961 amu has four isotopes. The masses of its isotopes are 49.94605 amu, 51.94051 amu, 52.94065 amu and 53.93888 amu. The first two isotopes have a total abundance of 87.87% and the last isotope has an abundance of 2.365%. What is the abundance of the third isotope? Answer text

A hypothetical element has only 3 isotopes, with the following masses: Isotope 1: 44.98 u Isotope 2: 48.99 u Isotope 3: 53.97 u If the natural abundance Isotope 1 is 16.11%, and that of Isotope 2 is 30.85 %, what is the average atomic mass of the element, in u? (Note: u is an atomic mass unit, sometimes referred to as amu) Enter the numerical value only (no units), using 4 significant figures.

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

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.)

(1) How many protons and neutrons are there in the nucleus of an atom that has an atomic number of 85 and a mass number of 218? protons = neutrons = (2) What is the symbol for the element? element =

Use chemical symbols and numbers to identify the following isotopes: (a) Potassium-39 : (b) Neon-22 : (c) Tungsten-184 : (d) Iodine-127 :

Silicon has three naturally occurring isotopes: 92.23% of Si-28 with an atomic weight of 27.9769 amu, 4.68% of Si-29 with an atomic weight of 28.9765 amu, and 3.09% of Si-30 with an atomic weight of 29.9738 amu. Calculate the average atomic weight to 4 significant figures. (Note: The specific isotope for the element is noted as Si-#). Answer: