Chapter 2- the-chemical-foundation-of-life.pptx - BIOLOGY...

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BIOLOGY 325: Inquiries in Biological ScienceChapter 2 Notes
Boundless.com/biologyThe ChemicalFoundation of LifeAtoms, Isotopes, Ions, and Molecules: The Building BlocksWaterCarbonFree to share, print, make copies and changes. Get yours at
The Structure of the AtomAtomic Number and MassIsotopesThe Periodic TableElectron Shells and the Bohr ModelElectron OrbitalsChemical Reactions and MoleculesIons and Ionic BondsCovalent Bonds and Other Bonds and InteractionsAtoms, Isotopes, Ions, and Molecules: The Building BlocksThe Chemical Foundation of Life > Atoms, Isotopes, Ions, and Molecules: The Build...Free to share, print, make copies and changes. Get yours at
An atom is composed of two regions: the nucleus, which is in the center of theatom and contains protons and neutrons, and the outer region of the atom, whichholds its electrons in orbit around the nucleus.Protons and neutrons have approximately the same mass, about 1.67 × 10-24grams, which scientists define as one atomic mass unit (amu) or one Dalton.Each electron has a negative charge (-1) equal to the positive charge of a proton(+1).Neutrons are uncharged particles found within the nucleus.The Structure of the AtomFree to share, print, make copies and changes. Get yours at ng-blocks-50/the-structure-of-the-atom-272-11405Structure of an atomView on Boundless.comThe Chemical Foundation of Life > Atoms, Isotopes, Ions, and Molecules: The Build...
Atoms of each element contain an equal number of protons and electrons.The number of protons determines an element's atomic number and is used todistinguish one element from another.The number of neutrons is variable, resulting in isotopes, which are differentforms of the same atom that vary only in the number of neutrons they possess.Together, the number of protons and the number of neutrons determine anelement's mass number.Since an element's isotopes have slightly different mass numbers, the atomicmass is calculated by obtaining the mean of the mass numbers for its isotopes.Atomic Number and MassFree to share, print, make copies and changes. Get yours at ding-blocks-50/atomic-number-and-mass-273-11406Atomic number, chemical symbol, and massnumberView on Boundless.comThe Chemical Foundation of Life > Atoms, Isotopes, Ions, and Molecules: The Build...
Isotopes are atoms of the same element that contain an identical number ofprotons, but a different number of neutrons.

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