Chap2,II - Chem. 200 Dr. Saidane Lecture Notes Chap 2, Part...

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

View Full Document Right Arrow Icon
Dr. Saidane Lecture Notes Chap 2, Part 2 Compounds Compounds are specific combinations of elements. Compounds are classified as either molecular or ionic. Molecular Compound , or molecule , is a neutral group of atoms that are bonded together. 1. The types of atoms present in a molecular compound are represented by molecular and empirical formulas. a) An empirical formula is a chemical formula that shows the smallest whole-number ratio of atoms in the compound. b) A molecular formula shows the composition of a molecule in terms of the number of atoms of each element present in a single molecule. 2. The arrangement of atoms in a molecule is represented by a structural formula . In a structural formula, the atoms are represented by their symbols, and lines show which atoms are bonded together. An ionic compound consists of positively charged ions, cations, and negatively charged ions, anions, stacked together so that the number of positive and negative charges is equal. 1. An ionic formula or formula unit is the simplest collection of positive and negative ions from which an ionic compound’s formula can be established. 2. Ions can be monoatomic , meaning that they consist of a single atom, or polyatomic , meaning that they consist of more than one atom bonded together. 3. Metallic elements typically form monoatomic cations , and their charges are related to the group to which they belong in the periodic table. 4. Only few nonmetallic elements (H, N, O, P, S, Se, F, Cl, Br, I) form monoatomic anions , and their charges are related to the group to which they belong. 1
Background image of page 1

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

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

This note was uploaded on 09/09/2011 for the course CHEM 200 taught by Professor Saidane during the Spring '11 term at Mesa CC.

Page1 / 4

Chap2,II - Chem. 200 Dr. Saidane Lecture Notes Chap 2, Part...

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