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What is the Bohr Atom Model's description of the position of an electron?
The atomic number Z of an element is equal to the total number of nucleons in the nucleus.
False
What is the definition of isotopes?
Atoms that have the same number of protons (Z1= Z2), but a different number of neutrons (N).
The mass number A of an element is equal to the total number of _________________ in the nucleus.
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What is the unit of energy obtained from Einstein's Equivalency Formula?
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The mass of an electron is negligible compared to the mass of a proton.
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Match the following elements with their properties:
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What is the relationship between the mass of a particle and its energy, according to Einstein's Equivalency Formula?
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The energy of 1 u is equal to __________________ J.
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Study Notes
Introduction to Physics
- The Bohr Atom Model describes the atom, stating that the exact position of an electron cannot be known at any given time.
- The position of an electron is described as a probability, referred to as an electron cloud.
Atomic Structure
- The atomic number (Z) of an element is equal to the number of protons in the nucleus of that element.
- The mass number (A) of an element is equal to the total number of nucleons (protons + neutrons).
Isotopes of Elements
- Isotopes are atoms that have the same number of protons (Z1= Z2), but a different number of neutrons (N1 ≠ N2), resulting in different atomic masses and physical properties.
Calculating Atomic Mass
- Example: The average atomic mass of Boron is 11.009305 u. To find the mass of the nucleus of one boron atom in kg, subtract the mass of 5 electrons from the atomic mass.
Einstein's Equivalency Formula
- The formula relates the mass of a particle to its energy.
- The energy of 1 u is calculated as: E = (1u) x c2 = 1.49 x 10-10 J = 931.5 MeV (megaelectron volt).
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Description
Learn about the basics of atomic structure, including the Bohr Atom Model and the concept of electron clouds. Understand how the atomic number of an element is defined.
