CHEM 101A Lecture Notes - Lecture 4: Sulfur, Main-Group Element, Valence Electron

• School: University of Arizona
• Department: Chemistry
• Course: CHEM 101A
• Professor: Laura Van Dorn

Document Summary

Cation or anion with more than one atom. Bonds to other ions by ionic bonding since it has a charge. Only put parenthesis around polyatomic when charges are unequal. Two electron bond where bonding atoms share valence electrons. Each element donates an electron to share. Molecule- group of atoms held together by covalent bonds. Solid line between two elements to show two electron bond. Non-bonded electron pairs (lone pairs)- unshared electrons. Atoms share electrons to gain noble gas configuration. Molecular formula shows number and identity of atoms in covalent compound. Does not tell which atoms are bonded together. Connectivity between atoms and bonding and nonbonding valence electrons. Give every main group element octet of electrons (not hydrogen) Always place halogens and hydrogens on the outside. Add valence electrons of each element in the compound to see how many electrons must be in the structure. Add a bond pair when an atom needs to complete its octet.