If S+2 ion has 18 electrons, the atomic number of S is * 16 18 20

Write the shorthand notation for an isotope of Fluorine that has an atomic number of 9 and 11 neutrons

Given the following atomic symbol: 41 19 X How many electrons are in this isotope of X?

Mass Symbol Neutrons Protons Electrons Charg Number 7"Ga2+ b) Using the information provided below for the three isotopes, determine the missing information. Mass lement Neutrons Protons Electrons Charge Number 24 22 -1 3 7. 50 74

9 4 Be + 1 1 H -    + 4 2 He what is the missing isotope

a) Compare the number of protons, neutrons, electrons, and nucleons for the two isotopes: Li-6 Li-7 number of protons number of neutrons number of electrons number of nucleons b) Chemical reactions only involve the outermost electrons. Why would you expect the two isotopes of lithium to have the same chemical properties ? c) Do neutrons affect chemical properties ? d) How is the number of protons related to the chemical properties ?

8 p For the following left-to-right description of isotopes, choose the best left-to-right list of isotope names: 16 neutrons and 15 electrons, 1C, atomic weight of 238 and 146 neutrons. O Phosphorous-31, carbon-14, uranium-238 Gallium-31, carbon-8, uranium-146 Sulfur-31, carbon-6, uranium-238 None of the above acer YA 106 DIO

Complete the table below (omit the subscript and superscript numbers for the Atomic Symbol): Name Atomic Symbol # protons Argon Iodine Cadmium 116 48 Cd Mass # 131 15 #neutrons 20 16 # electrons