Section 25.1 Lecture for Honors and Prep Chemistry

1. Bellwork- atomic structure Fill in the chart Subatomic particle Location (in or out of nucleus) Charge Mass Proton Neutron Electron

10. 25.1

11. 25.1

14. particle Alpha  Beta  Gamma  Mass 4amu ≈ 0 0 Charge +2 -1 0 Effect on nucleus loses two protons and two neutrons The ELEMENT changes converts a neutron to a proton & ejects an electron The ELEMENT changes loses energy The element does not change What it is Helium nucleus electron High energy electromagnetic radiation Stop it Paper/skin 1cm/metal foil Lead/concrete damage High ionization Medium ionization Lowest ionization