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Neutron

Chem

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Neutron

Protons, Neutrons, and Electrons Practice Worksheet Fill in the blanks in the following worksheet. Please keep in mind that the isotope represented by each space may NOT be the most common isotope or the one closest in atomic mass to the value on the periodic table. Atomic symbol Atomic number Protons Neutrons Electrons Atomic mass B 6 11 24 31 37 39 89 29 35 43 100 Pb 207 102 70 89 225 Mo 53 81 206 100 159 No 261 Yb 172 106 159 Finding Protons, Neutrons, and Electrons of Elements

Radioactivity and Nuclear Energy Notes

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Radioactive Decay Activation Energy (Ea): The threshold energy that must be overcome to produce a chemical reaction Electromagnetic Radiation: Radiant energy that exhibits wavelike behavior and travels through space at the speed of light in a vacuum Radioisotope: a radioactive isotope Many nuclei are radioactive Radioactive: Refers to a nucleus that spontaneously decomposes to form a different nucleus Over 85% of all known nuclides are radioactive Nuclear Equation: an equation representing radioactive decay Types of Radioactive (Nuclear) Decay (The spontaneous decomposition of a nucleus to form a different nucleus): Alpha Decay Alpha () particle shoots out from nucleus equivalent to helium-4 Beta Decay Beta () particle shoots out from nucleus equivalent to an electron Gamma Decay

Holt Earth Science Chapter 12, Section 12.3

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Dating With Radioactivity It is possible to measure numerical values for the age of Earth?s geologic activities - in billions and millions of years - by using radiometric dating. A. Reviewing Basic Atomic Structure An atom has a nucleus with protons (positive) and neutrons (proton+electron combined = neutral) orbited by electrons (negative charge). Atomic Number = number of protons in the nucleus; each element?s Atomic Number differs. Atoms of the same element have the same number of protons. 99.9% of an atom?s mass is in the nucleus - electrons have hardly any mass. By adding together the number of protons and neutrons, the atomic mass of an atom is obtained. The number of neutrons varies (called isotopes; have different atomic masses).

Campbell Biology Chapter 2 outline

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#AP Bio #CampbellBiology #Chapter 2 #Outline

SUBATOMIC PARTICLES Proton ? 1 positive charge (P+) Neutron ? no charge (N0) Electron ? 1 negative charge (E+) Nucleus An atom's dense central core, containing protons and neutrons. Electrons move around the nucleus Matter Anything that has mass and takes up space Elements Substance that cannot be broken down by a chemical reaction 92 occur naturally 25 of which are essential for life Bulk elements Required by the body in large amounts C N H O (make up 96% of the body) Trace elements Required by the body in small amounts Ultra trace elements Required by the body in minute amounts Atoms Smallest unit of matter that still retains properties of an element Weight Add proton and neutrons together for weight of nucleus Every proton and neutron weights one Dalton

Basic Biochemistry

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AP Biology Biochemistry

Atomic Structures Atoms are basic units of matter Protons (+1) , Neutrons (0), Electrons (-1) Depending on their energy levels, they are in different states. Ground state: At lowest possible potential energy. Excited state: At any state where the system is at higher than the minimum. Isotopes: atoms of one element that vary in neutrons. Are all chemically identical Radioisotopes: decay at a rate known as half-life, often used in medicine. Tracers: used to TRACE certain chemicals in natural pathways Ex: Iodine (radioactive) to give information about thyroid gland metabolism. Bonding In biology, the two main types are Ionic and Covalent Ionic Bonds Transfer of electrons Receiver is called anion (a negative ion) Donor is called the cation Covalent Bonds
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