# ISOTOPES

Topics: Isotope, Atom, Atomic number Pages: 3 (703 words) Published: December 7, 2014
﻿Experiment #: 1
Date: September 18, 2013
Title: Isotopes of Paperclipium
Purpose: To determine the isotopic composition of the element, paperclipium. Background Information: Isotopes are atoms of the same element with the same proton number but different mass number; that is, the number of neutrons differ. Isotopes of the same element have the same electronic configuration as they have the same number of electrons. This accounts for the fact that their chemical properties are the same, as the react similarly. However, their physical properties differ as the different masses result from different compositions. Most chemical elements consist of different mixtures of isotopes. Then molar values used in the periodic table are derived using the concept of weighted averages. The average mass of the element used is closer to the mass of the isotope present in higher abundance. The relative abundance refers to the ratio or percentage in which the isotope exists. The relative isotopic mass is the average mass of an isotope compared to one-twelveth the mass of a carbon-12 atom. List of Materials and Apparatus: container with paper clips, electronic balance, 10 small paper clips, 10 large paper clips Procedure: The number of the container, as well as the mass of the empty container, was recorded. The mass of the container with the paper clips was found and also recorded. The total mass of the large paper clips and the small paper clips were found separately. These masses were then recorded. Data Table:

Container Number
1
Mass of Empty Container / g
29.79
Mass of Container with Paper Clips / g
46.27
Total Mass of Large Paper Clips / g
10.57
Total Mass of Small Paper Clips / g
3.92

Calculations:
1. Find the total mass of the paperclips in the container.

Mass of paper clips = Mass of container with paper clips – Mass of empty container = 46.27 g -29.79 g
=16.48g

2. Find the average mass of a...