Lecture02-Ch02+Life+Chemistry+and+Energy

Numberofprotonsatomicnumber

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: elements: Carbon (C) Hydrogen (H) Nitrogen (N) Oxygen (O) Phosphorus (P) Sulfur (S) CONCEPT 2.1 ATOMIC STRUCTURE IS THE BASIS FOR LIFE’S CHEMISTRY • The number of protons identifies an element. • Number of protons = atomic number • For electrical neutrality, # protons = # electrons. • Mass number—total number of protons and neutrons • Atomic number? • Mass number? • What element? 3 CONCEPT 2.1 ATOMIC STRUCTURE IS THE BASIS FOR LIFE’S CHEMISTRY • Behavior of electrons determines whether a chemical bond will form and what shape the bond will have. FIGURE 2.1 ELECTRON SHELLS 4 CONCEPT 2.1 ATOMIC STRUCTURE IS THE BASIS FOR LIFE’S CHEMISTRY • Atoms with unfilled outer shells tend to undergo chemical reactions to fill their outer shells. • They can attain stability by sharing electrons with other atoms or by losing or gaining electrons. • The atoms are then bonded together into molecules. CONCEPT 2.1 ATOMIC STRUCTURE IS THE BASIS FOR LIFE’S CHEMISTRY • Octet rule—atoms with at least two electron shells form stable molecules...
View Full Document

Ask a homework question - tutors are online