Atomic Structure Fundemenatl Particles Flashcards
What are the three subatomic particles and their relative charge
Proton 1+
Neutron 0
Electron 1-
What is the relative mass for an electron
1/1840
What are isotopes
Particles with the same number of protons and a different number of neutrons
The relative mass is 1 for which subatomic particles
Proton and neutron
What are particles with the same number of protons and different number of neutrons
Isotopes
What is anion
An atom that has gained electrons so that there are more electrons that protons
What is an atom that has gained an electron so there are more electrons than protons
Anion
What is a mass number
The mass number is equal to the number of protons and neutrons combined
What charge does an atom have
Neutral
How do you work out the number of neutrons in an atom
Mass number - atomic number
How many electrons does an Al 3+ion have
10
Rutherford fired HE 2+ ions at a gold sheet. what did he observe at point P
when the HE2+ ions arrived at point P he concluded the most of the atom as empty space
Rutherford fired HE2+ ions at gold sheet what did he observe at point Q
he concluded that the atom must have a small positive nucleus
Describe Rutherford experiment
Rutherford fired HE2+ ions at a sheet of gold foil
when most He2+ ions passed through he concluded that most of the atom as empty space
a very small number of the He2+ ions were repelled
he concluded that the atom must have a small positive nucleus
what is the key difference between the Thompsons model and Bohr model
the Bohr model: a small positive nucleus, the electrons surrounded the nucleus in energy shells
Describe the Bohr model
Protons and neutrons are found in the center of the atom called the nucleus
protons and neutrons can also be called nucleons
electrons orbit around the nucleus in shells or energy levels
describe the plump pudding model
the plump pudding model has electrons surrounded by a volume of positive charge, like negatively ‘plums’ embedded in a positively charged ‘pudding’
