BIO_SC 1010 Lecture Notes - Lecture 4: Ricin, Atomic Number, Periodic Table
Document Summary
Branch of science that looks at composition, structure, and properties of matter. Everything on this planet is made of elements & chemicals. Can be natural or artificial, good or bad. Natural can be bad -- cyanide, arsenic, ricin (one of the most toxic -- caster beans) All chemicals, natural or artificial, can be dangerous at high doses. Matter: anything that occupies space and has mass. Mass: measure of the amount of material in an object. Elements: substances that cannot be broken down into other substances by chemical reactions. Compound: 2 or more elements come together in one substance. 98. 5% of your body is made up of just 6 elements. The additional 20 elements found in the body are found at extremely low levels (trace elements. Protons: positively charged particles located in the nucleus. Electrons: negatively charged particles found in orbitals surrounding the nucleus. Atomic number: determined by # of subatomic particles.
