'5 amu' diaporamas de présentation

Chapter 3 - Atoms:

394 views • 39 slides

J.J. Thomson

J.J. Thomson. Discoverer of the Electron. Background Information. Cathode Rays Form when high voltage is applied across electrodes in a partially evacuated tube. Originate at the cathode (negative electrode) and move to the anode (positive electrode) Carry energy and can do work

688 views • 31 slides

Homework 4 due today:14 Feb Homework 5 posted-due Wednesday 21 Feb

Homework 4 due today:14 Feb Homework 5 posted-due Wednesday 21 Feb. estimate average atomic masses for elements below. Isotope ~mass % abundanc e. ~ average mass. 1 H 1.008 99.985 2 H 2 .014 0.015. 1.008. 28 Si 27.98 92.2

275 views • 27 slides

Chapter 8 Chemical Composition

380 views • 25 slides

Isotopes

Isotopes. Isotopes of chlorine 35 Cl 37 Cl 17 17. chlorine - 35. chlorine - 37. Hyphen notation. Put the mass number after the name of the element carbon - 12 carbon - 14 uranium - 235. Isotopes. Chlorine-37 atomic #: mass #: # of protons: # of electrons: # of neutrons:.

256 views • 25 slides

Chapter 8 Chemical Composition

366 views • 20 slides

Chapter 5 Notes

306 views • 18 slides

Isotopes - What are they?

359 views • 17 slides

Average Atomic Mass

Average Atomic Mass. How much does an atom weigh?. Protons & Neutrons: ? 1.67 X 10 -24 gram Electrons: ? 9.10 X 10 -28 gram To avoid working with these really small numbers, scientists have developed the atomic mass scale. What is an a.m.u.?. atomic mass unit

329 views • 17 slides

Average Atomic Mass

Average Atomic Mass. In nature, most elements are a mixture of different isotopes The mass of a sample of an element is a weighted average of all the isotopes in the sample. _________________________. AVERAGE atomic mass. If 12.011 is the weighted average of the isotope masses,

115 views • 10 slides

Average Atomic Mass

Average Atomic Mass. Average of Isotopes. Every element typically exists in several isotope forms Isotopes are atoms of the same element with different numbers of neutrons

81 views • 6 slides