GEOL 100 Lecture Notes - Lecture 9: Radiant Energy, Relative Atomic Mass, Atomic Number
Document Summary
A: mass number (the sum of protons and neutrons. When different versions of the same element have the same atomic number (protons) but a different neutron number (neutrons) When different elements have the same neutron number (neutrons) but a different atomic number (protons). Isobars: nuclides of different elements. when different elements have different atomic and neutron numbers but the same mass numbers. S: (mass x abundance)/100 for isotope 1. T: (mass x abundance)/100 for isotope 2. They decompose spontaneously until they find the right form and become stable. (radioactive parent decay stable/radioactive daughter) This changes the z and n (protons and neutrons) of the element and it and radiant energy. transforms into another element. There are three different mechanisms/types of decay. Beta (negatron) decay : this adds one proton. Beta (positron) decay : subtracts one proton. Alpha decay : loses 2 protons and 2 neutrons (and the atomic number. Spontaneous nuclear fission: this only happens on the sun.
