40 Questions
What is the origin of the term 'isotope'?
From the Greek words 'iso' and 'topos'
What is the characteristic that is identical in isotopes of an element?
Chemical properties
How are isotopes often represented?
Using the element symbol and atomic mass number
What is the reason for the difference in physical properties of isotopes?
Difference in number of neutrons
What is the average atomic mass of an element influenced by?
The relative abundance of its isotopes
What is the formula to calculate the average atomic mass of an element with multiple isotopes?
Average Atomic Mass = (Atomic Mass of Isotope 1 × % Isotope 1) + (Atomic Mass of Isotope 2 × % Isotope 2)
What is the percentage of Cl-35 in chlorine atoms?
75% of chlorine atoms
What is the symbol for the isotope of chlorine with 17 protons and 18 neutrons?
Cl-35
What is the primary reason why isotopes occupy the same place on the periodic table?
They have the same number of protons.
What is the difference between the atomic mass number of Cl-35 and Cl-37?
2 u
What is the effect of different neutrons on the physical properties of isotopes?
It affects the stability.
What is the purpose of calculating the average atomic mass of an element?
To take into account the relative abundances of its isotopes.
What would happen if an element had only one isotope?
The average atomic mass would be equal to the atomic mass of the isotope.
Why do isotopes of an element have the same chemical properties?
Because they have the same number of protons and electrons.
What would be the result of miscalculating the relative abundance of an isotope?
An incorrect average atomic mass would be calculated.
What is the importance of considering the relative abundance of isotopes in calculating the average atomic mass?
To accurately reflect the weighted average of the atomic masses of the isotopes.
What is the main reason why isotopes of an element have different physical properties?
Difference in the number of neutrons
What is the significance of the atomic mass number in isotopes?
It represents the total number of nucleons in the nucleus
Why do chlorine atoms have an average atomic mass that is not a whole number?
Because chlorine has different isotopes with different atomic masses
What is the purpose of calculating the relative abundance of isotopes?
To calculate the average atomic mass of an element
What would be the effect of an element having only one isotope?
The element would have an average atomic mass that is a whole number
Why do isotopes of an element have the same place on the periodic table?
Because they have the same number of protons and electrons
What would happen if the relative abundance of an isotope were miscalculated?
The average atomic mass of the element would be incorrect
What is the reason why the atomic mass of an element is not always an integer?
Because the element has different isotopes
What is the primary reason why isotopes of an element have different atomic mass numbers?
Different number of neutrons
Which of the following statements is true about isotopes of an element?
They have different chemical properties due to different numbers of neutrons
What is the result of considering the relative abundance of isotopes in calculating the average atomic mass of an element?
The calculated average atomic mass is affected by the atomic mass number of the most abundant isotope
What is the main purpose of distinguishing between isotopes of an element?
To understand the physical properties and abundance of the element
Which of the following is a consequence of isotopes occupying the same place on the periodic table?
They have the same atomic number
What is the effect of the number of neutrons on the chemical properties of isotopes?
It has no effect on the chemical properties
How does the relative abundance of isotopes influence the average atomic mass of an element?
It affects the average atomic mass proportionally to the abundance
What is the relationship between the atomic mass number and the number of neutrons in an isotope?
The atomic mass number is the sum of protons and neutrons
What is the main difference between isotopes of an element?
Number of neutrons
Why do isotopes of an element have identical chemical properties?
Because they have the same number of protons and electrons
What is the purpose of calculating the average atomic mass of an element?
To account for the relative abundance of isotopes in an element
What is the relative abundance of Cl-35 in chlorine atoms?
75%
What is the effect of having different numbers of neutrons on isotopes?
Different physical properties
What is the result of calculating the average atomic mass of an element with multiple isotopes?
A decimal value
Why do isotopes of an element occupy the same place on the periodic table?
Because they have the same number of protons
What is the significance of the atomic mass number in isotopes?
It represents the sum of protons and neutrons
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