Chem_215_Lect_39_Color - Ch. 21: Nuclear Chemistry...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Ch. 21: Nuclear Chemistry • Radioactivity: – Term coined by Marie Curie to describe the emission of ionizing radiation by certain elements. – Emitted radiation is sufficiently energetic to eject electrons (ionize) or break chemical bonds. – Radiation either electromagnetic or particulate. • Types of Radiation: α particles: Nuclei of He atoms ( i.e., He 2+ ) β - particles: High energy electrons emitted by nuclei γ (gamma) rays: High energy electromagnetic Radiation
Background image of page 1

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

View Full DocumentRight Arrow Icon
α Particles – Ejected spontaneously from the nuclei of certain radioactive atoms. – Best thought of as a bundle consisting of two protons and two neutrons emitted from the nucleus. – Emission reduces mass of atom by 4 and number of neutrons by 2. – Deflected by electric and magnetic fields. – Produce ions as they travel through matter; easily stopped. e H h T U 4 2 234 90 238 92 + + 2 e H 4 2 Rules for writing nuclear reactions: - Sum of mass numbers must be the same on both sides. - Sum of atomic numbers must be the same on both sides.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/05/2009 for the course CHEM 2150 taught by Professor Chirik,p during the Fall '08 term at Cornell University (Engineering School).

Page1 / 14

Chem_215_Lect_39_Color - Ch. 21: Nuclear Chemistry...

This preview shows document pages 1 - 3. Sign up to view the full document.

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