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Questions and Answers
What does the atomic number of an atom represent?
What does the atomic number of an atom represent?
Where can the atomic number of an element be found in a periodic table?
Where can the atomic number of an element be found in a periodic table?
What happens when an atom has an unequal amount of protons and neutrons?
What happens when an atom has an unequal amount of protons and neutrons?
What is responsible for giving an atom its most notable characteristics?
What is responsible for giving an atom its most notable characteristics?
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What remains constant in all isotopes of an element?
What remains constant in all isotopes of an element?
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What is the mass number of an atom defined as?
What is the mass number of an atom defined as?
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How is an isotope of an element often represented?
How is an isotope of an element often represented?
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What is the atomic mass defined as on the periodic table?
What is the atomic mass defined as on the periodic table?
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What term is often used interchangeably with atomic mass?
What term is often used interchangeably with atomic mass?
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How is the average atomic mass calculated for an element with multiple isotopes?
How is the average atomic mass calculated for an element with multiple isotopes?
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Study Notes
Atomic Structure and Periodic Table
- Atomic number represents the number of protons present in the nucleus of an atom, which defines the identity of an element.
- The atomic number of an element can be found at the top of each element's box in a periodic table.
Atoms and Isotopes
- When an atom has an unequal number of protons and neutrons, it becomes an ion.
- The number of protons in an atom's nucleus is responsible for giving an atom its most notable characteristics.
Isotopes and Atomic Mass
- The mass number of an atom is defined as the total number of protons and neutrons in the nucleus.
- An isotope of an element is often represented by the symbol of the element followed by a hyphen and the mass number (e.g., C-12).
- The atomic mass of an element on the periodic table represents a weighted average of the masses of its naturally occurring isotopes.
- The term "atomic weight" is often used interchangeably with atomic mass.
- The average atomic mass for an element with multiple isotopes is calculated by taking the sum of the product of the mass of each isotope and its relative abundance.
Isotopes of Elements
- The atomic number (number of protons) remains constant in all isotopes of an element.
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Description
Test your knowledge about atomic numbers and their significance in defining an atom's characteristics. Understand the relationship between atomic numbers and the number of protons in an atom.
