Pick an element* from the periodic table and search online for information about
ID: 913042 • Letter: P
Question
Pick an element* from the periodic table and search online for information about it. The element MUST have more than one isotope. On a sheet of paper, record the following: The name of the element The common isotopes AND their percent abundances (Hint: use search phrases like "percent abundance of {insert element name here} isotopes" to find this information) Using Section 2.5 as a guide, calculate the average atomic mass of the element. Show your work! Does your calculated mass match the mass number for that element on the periodic table? A link or website title of where you found your information *You may not choose any elements which are already used as examples in Section 3.5 (carbon, oxygen, copper, nitrogen, boron or antimony). Pick an element* from the periodic table and search online for information about it. The element MUST have more than one isotope. On a sheet of paper, record the following: The name of the element The common isotopes AND their percent abundances (Hint: use search phrases like "percent abundance of {insert element name here} isotopes" to find this information) Using Section 2.5 as a guide, calculate the average atomic mass of the element. Show your work! Does your calculated mass match the mass number for that element on the periodic table? A link or website title of where you found your information *You may not choose any elements which are already used as examples in Section 3.5 (carbon, oxygen, copper, nitrogen, boron or antimony). Pick an element* from the periodic table and search online for information about it. The element MUST have more than one isotope. On a sheet of paper, record the following: The name of the element The common isotopes AND their percent abundances (Hint: use search phrases like "percent abundance of {insert element name here} isotopes" to find this information) Using Section 2.5 as a guide, calculate the average atomic mass of the element. Show your work! Does your calculated mass match the mass number for that element on the periodic table? A link or website title of where you found your information *You may not choose any elements which are already used as examples in Section 3.5 (carbon, oxygen, copper, nitrogen, boron or antimony).Explanation / Answer
I will consider chlorine
2 major isotopes of chlorines are:
35-Cl : atomic mass = 34.968852721 abundance=75.78%
37-Cl : atomic mass = 36.96590262 abundance=24.22%
Average mass of Cl = sum of (abundance * atomic mass)
= 0.7578*34.968852721 + 0.2422 * 36.96590262
= 35.4525
This is the atomic mass of Chlorine shown in periodic table