atomic structure for aqa gcse physics
TRANSCRIPT
This presentation is all about atomic structure
The Specification says………..
Basic Structure is a small central nucleus composed of protons and neutrons
Neutrons
Protons
The nucleus is surrounded by electrons
Protons have a positive charge, electrons have a negative charge and neutrons have no charge
Protons and neutrons are a similar size. Electrons are much smaller
In an atom the number of protons = the number of electrons
The atoms has overall no electrical charge
Atoms may lose or gain electrons to form ions
Isotope of an element
Isotopes – atoms have same numbers of protons but can have a different number of neutrons
The total number of protons in an atom is called the atomic number
The total number of protons and neutrons is called its mass number