P4 atomic structure

P4 atomic structure

1. an isotope is = same number of protons / electrons, same nuclear charge different number of neutrons / nuclear masses different

2. size of atom = 1 × 10 -10 m

   • relative mass proton 1 neutron 1 electron (about) 1 / 2000 accept protons and neutrons have the same mass accept electrons have tiny / negligible mass zero mass is neutral
     • more detailed description protons and neutrons make up the nucleus electrons orbit the nucleus electrons are in shells most of the atom is empty space nucleus occupies a very small fraction of the volume of the atom electrons orbit at a relatively large distance from the nucleus most of the mass of the atom is contained in the nucleus the nucleus as a whole is positively charged total number of protons in the nucleus equals the total number of electrons orbiting it in an atom
     • brief description contains protons, neutrons and electrons protons are positive electrons are negative neutrons are uncharged has a nucleus
       • brief description contains protons, neutrons and electrons protons are positive electrons are negative neutrons are uncharged has a nucleus
       • brief description contains protons, neutrons and electrons protons are positive electrons are negative neutrons are uncharged has a nucleus
       • atom = contains protons, neutrons and electrons protons are positive electrons are negative neutrons are uncharged has a nucleus
     • mass number = brief description contains protons, neutrons and electrons protons are positive electrons are negative neutrons are uncharged has a nucleus

3. relative charge proton +1 electron − 1 neutron 0