Ch 2 - (Isotopes) Flashcards
Define isotopes.
Isotopes are different atoms of the same element that contain the same no. of protons but different no. of neutrons.
What is the symbol for isotopes?
The symbol is the Chemical symbol (or word) followed by a dash and then mass no.
What is C - 14?
It is the isotope of carbon.
6 protons
6 electrons
14 - 6 = 8 neutrons.
What happens to the chemical properties of isotopes of the same element?
Isotopes of the same element display the same chemical characteristics.
Why is the chemical characteristics still the same?
This is because they have the same no.of electrons in the outer shell and therefore have the same electronic configuration and this is what determines an atom’s chemistry.
What happens to the physical properties of isotopes of the same element?
It changes
Why do the physical properties of isotopes of the same element differ?
The difference in mass affects physical properties such as density, boiling point, and melting point.
What do, H - 1, H - 2, and H - 3 represent?
H - 1 = Hydrogen 1
H - 2 = Deuterium
H - 3 = Tritium
What do RAM and AMU stand for?
RAM - Relative Atomic Mass
AMU - Atomic Mass Unit
What is the symbol for relative atomic mass?
Ar
What can the relative atomic mass be defined as?
The average mass of the isotopes of an element compared to 1/12 th of the mass of 12C
How can the relative atomic mass of an element be calculated?
With the mass no. amd relative abundance of all the isotopes of the element.
What is the formula for relative atomic mass?
Ar = (% of isotope 1 x mass no. Of isotope 1) (% of isotope 2 x mass no. of isotope 2) / 100
What is the difference between RAM and AMU?
RAM is the average (rounded) mass of the isotope.
AMU is the accurate mass of an isotope.
What happend to the chemical property of isotopes?
Same chemical characteristics
