1 / 11

Ch. 7.1 - Part 1 - The Elements

Ch. 7.1 - Part 1 - The Elements. CHM Hon. First, things to Remember…. What is IONIZATION ENERGY? What is the general trend? What is ELECTRONEGATIVITY? What is the general trend? What are the REPRESENTATIVE ELEMENTS and why are they called “representative”?. Properties of s-block elements.

kalia-houston
Download Presentation

Ch. 7.1 - Part 1 - The Elements

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. Ch. 7.1 - Part 1 -The Elements CHM Hon.

  2. First, things to Remember… • What is IONIZATION ENERGY? What is the general trend? • What is ELECTRONEGATIVITY? What is the general trend? • What are the REPRESENTATIVE ELEMENTS and why are they called “representative”?

  3. Properties of s-block elements • There are 92 naturally occurring elements in the Universe

  4. Properties of s-block elements • Representative elements • Group 1A – 7A • Valence electrons: # and location determine the chemical properties • Metals: tend to lose electrons • Nonmetals: tend to gain electrons

  5. Properties of s-block elements • Diagonal relationships • The close relationship between elements in neighboring groups

  6. Properties of s-block elements • Diagonal relationships • Some period 2 elements do not behave as predicted by their location on the p.t. • Period 2 elements have more in common with period 3 elements in the next group

  7. Properties of s-block elements • HYDROGEN • Group 1A • 1 Valence electron • Not part of any specific group • Has properties of a metal and a nonmetal

  8. Properties of s-block elements • HYDROGEN • Discovered by Henry Cavendish 1776 • Flammable air

  9. Properties of s-block elements • HYDROGEN • Named Hydrogen by Lavoisier 1783 • “to form water” hydro + genes

  10. Properties of s-block elements • HYDROGEN • Universe is more than 90 % H by mass • 3 isotopes • Protium (99.9%) H-1 • Deuterium H-2 • Used in nuclear reactors - “heavy water” • Tritium H-3

  11. Properties of s-block elements • HYDROGEN • Acts like both a metal and nonmetal • Nonmetal • Gains an electron • Acquires the stable electron configuration of He • Metal • Acts like a metal when reacting with a nonmetal • Loses its single electron  becomes a H+ ion

More Related