1 / 9

The ATOM

The ATOM By convention there is color, By convention sweetness, By convention bitterness, But in reality there are atoms and space. - Democritus (c. 400 BCE). Mass Number. Atomic Structure . ATOM. NUCLEUS. ELECTRONS. NEUTRONS. PROTONS. NEGATIVE CHARGE. POSITIVE CHARGE. NEUTRAL CHARGE.

bing
Download Presentation

The ATOM

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The ATOM • By convention there is color,By convention sweetness,By convention bitterness,But in reality there are atoms and space. • -Democritus (c. 400 BCE)

  2. Mass Number Atomic Structure ATOM NUCLEUS ELECTRONS NEUTRONS PROTONS NEGATIVE CHARGE POSITIVE CHARGE NEUTRALCHARGE Atomic Number equals the # of...

  3. Scale of the atom

  4. Atomic Mass Units atomic mass unit (amu) = the mass of one proton 1.66  10-27 g

  5. Mass Number Sum of the protons and neutrons in the nucleus of an atom Always a whole number # of neutrons = mass # - atomic # AtomicNumber The number of protons within the nucleus

  6. Mass # Atomic# Isotopes Atoms of the same element with different numbers of neutrons Isotope symbol: 6 C “Carbon-12”

  7. Atomic mass is an average • How to calculate the average atomic mass of an element: • List all isotopes,mass numbers, and percent relative abundance of an element • Multiply the mass number of each isotope by its relative abundance • Add all the products together = atomic mass

  8. An example: • Chlorine-35 (35Cl) has 17 protons and 18 neutrons and has a relative abundance of 75.8% • Chlorine-37 (37Cl) has 17 protons and 20 neutrons and appears 24.2% of the time. • Multiply the mass number of each isotope by its relative abundance • (Chlorine-35) 35 amu× 0.758 = 26.53 amu • (Chlorine-37) 37 amu× 0.242 = 8.95 amu • Add all the products together = atomic mass • 26.53 amu + 8.95 amu = 35.48 amu

More Related