1.1.1, 1.1.3: The Atom and relative mass Flashcards
All elements are made up of
Atoms
Atoms are made up of 3 types of particle
Protons
Neutrons
Electrons
Electrons
Charge
-1 charge
Electrons in atoms in
Orbitals
What takes up most of the volume of the atom
Orbitals
Where is most of the mass of the atom concentrated
Nucleus
Diameter of the nucleus compared to go the whole atom
Small
Which 2 particles in the nucleus
Protons and neutrons
Proton mass and charge
1 and +1
Neutrons mass and charge
1 and 0
Electron mass and charge
1/2000 and -1
Nuclear symbols
Show numbers of subatomic particles
Nuclear symbol
A
Total number of protons and neutrons in the nucleus
Mass number
Nuclear symbol
X
Element symbol
Nuclear symbol
Z
Number of protons in the nucleus
Atomic proton number
Number of neutrons
Mass number - atomic number
Isotope
Atoms of the same element with the different numbers of neutrons
What determines chemical properties of an element
Number and arrangement of electrons
What determines physical properties of atoms
Mass of the atom
Ar
Relative atomic mass
Relative atomic mass
Mean mass of an atom of an element compared to 1/12th the mass of a 12C atom.
Mr
Relative molecular mass
Relative molecular mass
The mean mass of a molecule compared to 1/12th the mass of a 12C atom
Avogadros constant
6.022 x 10(23)
Molecular formula
The actual number of atoms of each element in 1 molecule of a compound
Empirical formula
Simplest whole number ratio of atoms of each element
Positive ions
cations
Negative ions
anions
Relative masses compared to
carbon -12
