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# Physics Introduction to Atomic Structure

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### What is the Bohr Atom Model's description of the position of an electron?

A probability cloud

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.

<p>nucleons (protons + neutrons)</p> Signup and view all the answers

### What is the unit of energy obtained from Einstein's Equivalency Formula?

<p>Both a and b</p> Signup and view all the answers

### The mass of an electron is negligible compared to the mass of a proton.

<p>True</p> Signup and view all the answers

### Match the following elements with their properties:

<p>Boron = Proton Atomic number 5 = Mass of 0.00055 u</p> Signup and view all the answers

### What is the relationship between the mass of a particle and its energy, according to Einstein's Equivalency Formula?

<p>E = mc^2</p> Signup and view all the answers

### The energy of 1 u is equal to __________________ J.

<p>1.49 x 10-10</p> Signup and view all the answers

## 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.

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