What is necessary to calculate the atomic mass of an element?
Together, the number of protons and the number of neutrons determine an element’s mass number: mass number = protons + neutrons. A property closely related to an atom’s mass number is its atomic mass. The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu.
How do you find the atomic mass of an isotope given the abundance?
Sample Problem: Calculating Atomic Mass Change each percent abundance into decimal form by dividing by 100. Multiply this value by the atomic mass of that isotope. Add together for each isotope to get the average atomic mass.
What conditions must occur for two atoms to be isotopes How is average atomic mass determined?
The number of neutrons is variable, resulting in isotopes, which are different forms of the same atom that vary only in the number of neutrons they possess. Together, the number of protons and the number of neutrons determine an element’s mass number.
How do isotopes affect mass?
The quoted atomic mass on the Periodic Table is the WEIGHTED average of the individual isotopic masses. The higher the isotopic percentage, the MORE that isotope will contribute to the isotopic mass. For this reason, most masses that are quoted on the Table are non-integral.
What do you need to know to determine the atomic structure of an atom?
The atomic number tells you the number of protons, and if the atom is neutral, the number of electrons, and that electrons are located in the electron cloud surrounding the nucleus. If you know the atomic number of an element, you can determine the number of protons and electrons.
What conditions must occur for two atoms to be isotopes?
If two atoms have different numbers of protons, they are different elements. However, if two atoms have the same number of protons, but different numbers of neutrons we refer to them as isotopes. Two terms we use to identify nuclides (isotopes) are atomic number and mass number.