Atomic Structure. - ppt download
{"Image DocumentName": "Atomic Structure 4 He 2 HELIUM ATOM proton Shell nucleus", "Image ImageDescription": "# electrons = # protons. electron. neutron. He ATOMIC MASS NUMBER = number of protons + number of neutrons. ATOMIC NUMBER = number of protons.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}