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Questions and Answers
What is the atomic mass of an element?
What is the atomic mass of an element?
- The mass of an atom without electrons
- The weighted average of all isotopes of an element (correct)
- The sum of protons and electrons in an atom
- The sum of protons and neutrons in an atom (correct)
How is atomic mass typically expressed in scientific measurement?
How is atomic mass typically expressed in scientific measurement?
- In kilograms
- In atomic mass units (amu) (correct)
- In grams
- In molecular weight units
Why are atomic mass and atomic weight considered synonymous terms?
Why are atomic mass and atomic weight considered synonymous terms?
- They both describe the mass of protons
- Both refer to the mass of electrons
- They are both determined by the number of neutrons alone
- They are both calculated from the isotopic composition of an element (correct)
What does a weighted average in relation to atomic mass indicate?
What does a weighted average in relation to atomic mass indicate?
Using the provided example, what is the atomic weight of hydrogen if 95% is hydrogen-1, 3% is hydrogen-2, and 2% is hydrogen-3?
Using the provided example, what is the atomic weight of hydrogen if 95% is hydrogen-1, 3% is hydrogen-2, and 2% is hydrogen-3?
What would the average atomic mass of Sodium be based on the following isotopic abundances: Sodium-23 (91%), Sodium-22 (8%), Sodium-24 (1%)?
What would the average atomic mass of Sodium be based on the following isotopic abundances: Sodium-23 (91%), Sodium-22 (8%), Sodium-24 (1%)?
Which statement is incorrect regarding atomic mass?
Which statement is incorrect regarding atomic mass?
What does the atomic number of an atom represent?
What does the atomic number of an atom represent?
Why do isotopes of the same element have different mass numbers?
Why do isotopes of the same element have different mass numbers?
How is an isotope commonly represented in notation?
How is an isotope commonly represented in notation?
What is true about the electrons in an atom compared to its isotopes?
What is true about the electrons in an atom compared to its isotopes?
What stays constant for an element while forming isotopes?
What stays constant for an element while forming isotopes?
Which element has the atomic number 79?
Which element has the atomic number 79?
What is the mass number of an isotope that has 1 proton and 2 neutrons?
What is the mass number of an isotope that has 1 proton and 2 neutrons?
What does the atomic number represent for an atom?
What does the atomic number represent for an atom?
Which statement is true regarding isotopes?
Which statement is true regarding isotopes?
What is the mass number of an atom determined by?
What is the mass number of an atom determined by?
How can isotopes of hydrogen differ?
How can isotopes of hydrogen differ?
What is the correct hyphen notation for the isotope of carbon with 6 protons and 8 neutrons?
What is the correct hyphen notation for the isotope of carbon with 6 protons and 8 neutrons?
What does the atomic number signify in the context of DNA comparison?
What does the atomic number signify in the context of DNA comparison?
Which of the following elements has an atomic number equal to 6?
Which of the following elements has an atomic number equal to 6?
What remains constant for an element when it forms isotopes?
What remains constant for an element when it forms isotopes?
What is the atomic mass of an element based on?
What is the atomic mass of an element based on?
What does the atomic mass unit (amu) represent in atomic measurements?
What does the atomic mass unit (amu) represent in atomic measurements?
How is the atomic weight of an element determined?
How is the atomic weight of an element determined?
If an element shows isotopes with 70% of Mass Number 1 and 30% of Mass Number 3, how is its atomic weight approximated?
If an element shows isotopes with 70% of Mass Number 1 and 30% of Mass Number 3, how is its atomic weight approximated?
Which of the following statements about atomic mass is true?
Which of the following statements about atomic mass is true?
What is the atomic mass of Oxygen based on the provided periodic table data?
What is the atomic mass of Oxygen based on the provided periodic table data?
Why is the concept of weighted averages significant in understanding atomic mass?
Why is the concept of weighted averages significant in understanding atomic mass?
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Study Notes
Atomic Number
- The atomic number of an atom represents the number of protons in the atom.
- The atomic number is a defining characteristic of an element.
- The atomic number is always a whole number.
- The atomic number can be found on the periodic table above the element's symbol.
Isotopes
- Isotopes are atoms of the same element with different numbers of neutrons.
- The atomic number (number of protons) remains constant in isotopes.
- The number of neutrons can vary.
- Isotopes have different atomic masses.
Atomic Mass
- Atomic mass is the sum of the protons and neutrons in an atom.
- Atomic mass is measured in atomic mass units (amu).
- Atomic mass is synonymous with atomic weight.
- The atomic mass of an element is the weighted average of the masses of its naturally occurring isotopes.
How to Find Atomic Mass
- The atomic mass of an element can be found on the periodic table.
- The atomic mass is the decimal number within each element's box on the periodic table.
- Atomic mass takes into account the abundance of each isotope of the element.
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