F321-The Atom Flashcards
Where are electrons found?
In the shells of an atom
What does the nucleus of an atom contain?
Protons and neutrons
What is the relative charge and relative mass of a proton?
R Charge = 1+
R Mass = 1
What is the relative charge and relative mass of a neutron?
R charge = 0
R mass = 1
What is the relative charge and relative mass of an electron?
R charge = 1-
R mass = 1/2000 (negligible)
Define isotopes
Atoms of the same element with a different number of neutrons
What does the top number of an element represent?
Relative atomic mass (number of protons and neutrons)
What does the bottom number of an element represent?
Atomic number (number of protons/electrons)
Mass number
The number of protons and neutrons in the nucleus of an atom
Atomic number
The number of protons in the nucleus of an atom
What are the 3 isotopes of Hydrogen?
Protium, Deuterium, Tritium
Define relative isotopic mass
The mass of an atom of an isotope compared with 1/12th of the mass of an atom of C-12
Define relative atomic mass
The weighted mean mass of an atom of an element compared with 1/12th of the mass of an atom of C-12
How do you calculate the relative atomic mass of an element?
Multiply together each percentage abundance by the isotope number individually. Then add them all together and divide by 100.
Do you add or subtract the number of a positive charge off/on to the electrons
Subtract