atomic structure

• radius of an atom-1x10-10m
• describe the structure of an atom- a positively charged nucleus composed of both protons and neutrons surrounded by negatively
• how are electrons in orbit around an atom?

  the electrons are arranged at different distances from the nucleus
• what do all atoms of the same element have in common?

  protons
• isotope- an element with a different number of neutrons in the nucleus
• before electrons what did people think atoms looked like?

  tiny spheres that could not be divided
• how did the plum pudding model describe the atom? - a ball of positive charge with negative electrons embedded in it
• what ideas did the alpha scattering (Rutherfords scattering) experiment lead to ?

  the mass was mainly in the nucleus

  nucleus is positively charged

  electrons orbit at a distance
• what did neils bohr suggest about the electrons?

  electrons orbit the nucleus at specific distance
• what particle did james chadwick discover?

  Neutron