Chapter 20 - Chapter 20: Nuclear Chemistry (1,4,6,7) I....

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 20: Nuclear Chemistry (1,4,6,7) I. Radioactivity a. Unstable nuclei b. Nucleus i. Protons: +1, 1 amu ii. Neutrons: 0, 1 amu iii. Atomic # = n p (# protons) iv. Mass # = n p + n n c. Isotope (differ in # of neutrons) 16 8 O i. H isotopes 1. 1 1 H 2. 2 1 H = deuterium (stable) 3. 3 1 H = tritium ii. Molar mass of elements is average of isotopes iii. Bi = last element with stable isotope II. Modes of Radioactive Decay a. Alpha Decay i. Kicks out alpha particle (nucleus of He) ii. 4 2 He = α = + charge iii. Ex. 238 92 U → 4 2 He + 234 90 Th 1. Subscripts and superscripts are balanced b. Beta Decay i. Electrons ejected ii. 0 -1 e = β - iii. subscript = charge iv. Ex. 227 88 Ra → 0 -1 e + 227 89 Ac 1. Electron comes from nucleus 2. Neutron has turned into a proton, also creating an electron a. 1 0 n → 1 1 p + 0 -1 e c. Electron Capture i. Electron in cloud (1s orbital) gets absorbed by nucleus ii. Ex. 200 82 Pb + 0 -1 e → 200 81 Tl d. Positron Emission i. 0 +1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/27/2011 for the course CHEM 0120 taught by Professor Golde during the Spring '07 term at Pittsburgh.

Page1 / 4

Chapter 20 - Chapter 20: Nuclear Chemistry (1,4,6,7) I....

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online