03Notes-PeriodicTrendsII

03Notes-PeriodicTrendsII - Why do metals want to lose...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Pluchino – Regents Chemistry Periodic Table and Trends – 03 Periodic Trends II Aim: What patterns exist in the periodic table? Do Now: What happens to electrons in a bond? Electronegativity: the ability of an atom to attract electrons in a chemical bond. Arbitrary scale, no units. LEFT to RIGHT across a PERIOD electronegativity INCREASES TOP to BOTTOM in a GROUP electronegativity DECREASES Why do we observe this trend??? Small atoms have strong nuclei which can attract electrons towards themselves. Large atoms have weaker nuclei which cannot attract electrons towards themselves. Electron Affinity The amount of energy released when an atom gains and electron. Measured in kJ/mol. Cl has the greatest electron affinity.
Background image of page 1

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

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Why do metals want to lose electrons and nonmetals want to gain electrons? Elements in the s and p blocks want to attain an octet of electrons and look like noble gases. This is a very stable configuration. Ionic Radius: the radius of a cation or anion. Measured in picometers (pm). Cations become smaller Anions become larger Conclusions: Electronegativity how well does an atom pull electrons to itself in a bond? o Increases across the period o Decreases down a group Electron affinity is the amount of energy released when an atom gains an electron Ionic radius how big is the ion? o Cations get smaller o Anions get bigger...
View Full Document

Page1 / 2

03Notes-PeriodicTrendsII - Why do metals want to lose...

This preview shows document pages 1 - 2. Sign up to view the full document.

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