Chapter 2 - Atomic Structure of Matter Chapter 2 Atoms and...

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

View Full Document Right Arrow Icon
Chapter 2 Atoms and Molecules Dr. Manuel P. Soriaga Department of Chemistry Atomic Structure of Matter Simplest model: tiny nucleus (10 –13 cm diameter) surrounded by electrons (about 10 –5 cm away) Nucleus contains protons and neutrons An Image of Iodine Atoms Soriaga Research Laboratories Constituents of the Atom Electrons, protons and neutrons Particle Mass ( Da ) Charge Electron (e ) 0.000548 1– Proton (p or p + ) 1.0073 1+ Neutron (n or n 0 ) 1.0087 0 1 Dalton (Da) = 1 Atomic Mass Unit (amu) 1 (Da) 1 / 12 of the mass of C-12 atom = 1.66 × 10 -24 g Neutral atom contains an equal number of protons and electrons A non-neutral is called an ion Isotopes Same number of protons but different number of neutrons Identical chemical properties E.g., Hydrogen has three isotopes: H 1 1 Hydrogen: 1 neutrons D 1 2 Deuterium: 2 neutrons T 1 3 Tritium: 3 neutrons Atomic Notation: Nuclide Symbol X A Z 11 protons 11 electrons 12 neutrons Mass of 23 Da The atom with the symbol has: 11 23 Na E = Atomic symbol A = Mass number = p + + n 0 Z = Atomic number = p +
Background image of page 1

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

View Full DocumentRight Arrow Icon
Ag Silver Al Aluminum Au Gold B Boron Br Bromine C Carbon Ca Calcium Cl Chlorine
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 02/23/2011 for the course CHEM 101 taught by Professor Williamson during the Spring '08 term at Texas A&M.

Page1 / 6

Chapter 2 - Atomic Structure of Matter Chapter 2 Atoms and...

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