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atoms, ion and molecules - Coggle Diagram
atoms, ion and molecules
atoms
atoms are the smallest particles of an element
structure
an atom consists of a nucleus. (the nucleus contains protons and neutrons)
electrons move around the nucleus at high speed in regions known as electron shells
properties of sub-atomic particles
relative mass
neutron : 0
electron : -1
proton : +1
relative change
neutron : 1
proton : 1
electron : 1/1840
description
neutron : a neutral (no charge) particle with a relative mss equal to a proton
electron : a negatively-charge particle with negligible mass
proton : a positively-charged particle with a relative mass equal to a neutron.
proton and mass number
the number of protons in their atoms is called the proton number or atomic number
element are arranged in the Periodic Table according to their proton number
proton number or atomic number = the number of protons in the nucleus of an atom