Atomic Structure Flashcards
What’s a atom
Smallest part of an element that can exist
What is daltons model of the atom
Atoms as solid spheres that could not be divided into smaller parts
What is the plum pudding model of the atom
Spher of positive charge with negative electrons embedded in it
What did scientists discover in the alp0ha scattering experiment
Salome alpha particles were deflected by the gold foil-this showed that an atoms mass and positive charge must be concentrated in one small space(nucleus)
Describe the nuclear model for the atom
Dense nucleus with electrons orbiting it
What did Niels Bohr discover
Electrons orbit in fixed energy levels (shells)
What did James Chadwick discover
Uncharged particle called the neutron
Where are protons and neutrons
In the nucleus
What is the relative mass of each sub atomic particle
Proton 1. Neutron 1. Electron0 (very small)
What is the relative charge of each sub atomic particle
Proton +1. Neutron0 Electron-1
How can you find out the number of protons in an atom
Mass numbers - atomic number
How can you calculate the number of neutrons in an atom
Mass number -atomic number
Why do atoms have no overall charge
Equal numbers of positive protons and negative electrons
How many electrons would you place in the first second and third shells
Up to 2 in the first shell and up to 8 in the others
What’s is a element
Substance mad of one type of atom
