Atomic Structure Flashcards
What Is Daltons model ?
Daltons atomic theory proposed that all matter was composed of atoms indivisible and indestructible building blocks.While all atoms of an element were identical, different elements had atoms of differing size and mass.
What was Democritus belief about atoms?
Atoms are indivisible.
What did J. J Thomson develop (1897)
Plum pudding model = positive Ball that contains negatively charged particles (electrons).
What did rutherford discover 1912?
Gold foil experiment proved the plum pudding model wrong. Fired alpha -particles into a thin sheet of Gold foil, some of the particles were deflected and some went through. Discovered protons and atom is mostly empty space. Discovered a nucleus that’s positively charged.
What did Neil’s Bohr discover 1913?
He came up with the Nuclear model and with the electron shells. That each shell has a fixed energy.
What did James Chadwick discover?
He discovered neutrons.
What is nucleons?
Things that live in the nucleus. For example protons and neutrons.
What is the relative mass properties for protons,neutrons and electrons.
Proton : 1
Neutron : 1
Electron : 1/1840
What is the relative charge for the subatomic particles?
Proton : + 1
Neutron : 0
Electron : -1
What is an isotope?
Element with the same number of protons but different number of neutrons.
Which is more reactive Fe2+ or Fe3+ ??
What is the definition of mass number?
Number of protons plus the number of neutrons.
Why do isotopes have the same chemical property?
Because they have the same electron arrangement.
Do isotopes have the same physical property?
No.
How to calculate the relative atomic mass?
Sum of the isotope mass X the abundance of the isotope
