University:
Jackson College
Course:
CEM | 241 Organic Chemistry I
Academic year:

2022
Views:

491

Pages:

3
Author:

micikaax

Isotope and Ions Practice Worksheet Part I: Isotopes 1. Define an isotope. ● Isotopes are atoms of the same element with different atomic masses 2. What would happen if the number of protons were to change in an atom? ● You would get a different element 3. Another way to write isotopes is to write the name of the element then add the mass number after a dash, for example, 146C is carbon-14. Why isn’t the atomic number needed for this notation? ● We do not need the atomic number for this notation because all isotopes have the same atomic number and the number stays the same. 12 13 14 4. Here are three isotopes of an element: 6 C 6 C 6 C a. The element is: ______Carbon____________ b. The number 6 refers to the ___Atomic number______________________ c. The numbers 12, 13, and 14 refer to the ____Atomic mass____________________ d. How many protons and neutrons are in the first isotope? ___p=_6 and n=6_____________ e. How many protons and neutrons are in the second isotope? p=6 n = _7________________ f. How many protons and neutrons are in the third isotope? p = 6__n = 8_______________ Complete the following chart: Isotope name atomic # mass # # of protons # of neutrons 92 uranium-235 92 235 92 143 92 92 uranium-238 92 238 92 146 92 5 boron-10 5 10 5 5 5 5 boron-11 5 11 5 6 5 Part II: Ions Determine the charges on the following using the diagram above as a guide: 1. An atom having lost two electrons ___+2_ __ # of electrons 2. An atom having lost six electrons 3. An atom having gained one electron 4. An atom having gained three electrons 5. An atom having lost five electrons 6. An atom having gained two electrons 7. An atom having lost one electron 8. An atom having gained four electrons ___+6_ __ ____1__ ___3___ ___+5_ __ __2____ ___+1_ __ ___4___ Complete the following: 1. For each of the positive ions listed in column 1, use the periodic table to find in column 2 the total number of electrons that ion contains. The same answer may be used more than once. __B__ 1. Al+3 A. 2 B. __D__ 2. Fe+3 10 C. __B__ 3. Mg+2 21 D. __H__ 4. Sn+2 23 E. __F__ 5. Co+2 24 F. __E__ 6. Co+3 25 G. __A__ 7. Li+1 36 H. __C__ 8. Cr+3 48 I. __G__ 9. Rb+1 76 J. __I__ 10. Pt+2 81 Element/Ion H 1 Atomic Number 1 Number of Protons 1 Number of Neutrons 0 Number of Electrons 1 Mass Number 1 1 1 0 1-1=0 1 17 17 18 18 35 12 12 12 10 24 1 H+ 1 1 35Cl17 Mg2+ 24 12 Ag+ 47 47 61 47 108 S 16 16 16 18 32 66 30 Zn 2+ 190 76Os 30 30 36 28 66 76 76 114 76 190 108 47 32 216 Answer the following questions: 1. Define an ion. An atom or group of atoms that has a positive or negative charge 2. a. How can you tell if an atom has a negative charge? What type of Ion is this? A negative charge ion is more electrons than protons. It is a anion b. How can you tell if an atom has a positive charge? What type of ion is this? A positive charge ion has more protons than electrons. It is cation