Isotopes Flashcards
(15 cards)
Define isotopes
Different atoms of the same element that have the same number of protons but different numbers of neutrons
Isotopes have identical chemical properties due to the same electronic configuration.
What do isotopes of the same element have in common?
They have the same number of protons and electrons
The difference lies in the number of neutrons.
Give an example of isotopes of carbon.
Carbon-12 has 12 protons and 12 neutrons; Carbon-13 has 12 protons and 13 neutrons.
How are symbols for atoms represented?
Elements are written with their mass number on top and atomic number on the bottom, e.g., 12 6C.
The atomic number indicates the number of protons.
What does the atomic number represent?
The number of protons in an atom.
What is the relationship between atomic number and mass number?
The atomic number can be used to work out the mass number and vice versa.
What does a plus or minus symbol indicate in ion notation?
It indicates whether the ion is positive or negative.
Interpret the symbol 2311Na+.
Mass number is 23, atomic number is 11, and the plus symbol indicates that an electron has been lost.
How do you determine the number of neutrons in an atom?
Subtract the atomic number from the mass number.
Interpret the symbol 35
17Cl-.
Chloride ion has 17 protons, 18 neutrons, and 18 electrons.
True or False: Isotopes of the same element have different chemical properties.
False
They have the same chemical properties because they have the same number of electrons.
What is relative atomic mass?
An average value that takes into account the abundance of the isotopes of the element.
Calculate the relative atomic mass of carbon with isotopes Carbon-14 (20% abundance) and Carbon-12 (80% abundance).
12.4
Calculation: ((14 x 20) + (12 x 80)) ÷ 100 = 12.4
Fill in the blank: The equation for relative atomic mass is (_________ 1 mass × abundance) + (_________ 2 mass × abundance) / 100.
isotope, isotope
