BSC 1005 Lecture Notes - Lecture 3: Subatomic Particle, Atomic Nucleus, Thyroid
Document Summary
Atom, element, molecule, compound, subatomic particles, ion, isotope, orbitals, bonds, ph. Matter is anything that takes up space and mass. An element is a substance that cannot be broken down to other substances. Out of 94 naturally occurring elements, about 25 are essential for life. The most abundant elements in living organisms are carbon, hydrogen and oxygen. Most of the hydrogen and oxygen are in the form of water. Carbon is the most important structural element in living organisms. Trace elements - elements required by organisms in minute quantities. Iodine in humans, deficiency results in goiter (enlarged thyroid gland) Atom the smallest portion of a substance that retains the properties of an element. Atomic nucleus where protons and neutrons are tightly packed. Elements are pure substances, each consisting only of atoms that have the same number of protons in their nucleus. Subatomic particle: protons (+, electrons (-, neutrons (no charge) Mass number: number of protons and neutrons.
