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Reid Unit 3 Chem I Answer Key

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Atomic History
#1 Scientist whose alpha particle scattering experiment led him to conclude that the nucleus of an atom contains a dense center of positive charge. Rutherford
#2 The first scientist to show that atoms emit negative particles using his cathode ray experiment. Thomson
#3 First to use the term atom. Democritus
#4 Identified the charge on the electron using the Oil Drop Experiment Milikan
#5 Proposed the Law of Conservation of Matter. Dalton
Atomic Structure
#1 What are the three subatomic particles? protons, neutrons and electrons
#2 The sum of protons and neutrons is the atomic mass
#3 The number of protons indicates the identity of the element and the atomic number
#4 Atom with the same number of protons but different number of neutrons isotope
#5 Atom that has gained or lost electrons ion
Isotopes, Ions, and Such
#1 How many electrons are in the outermost energy level of an electrically neutral atom of nitrogen 5
#2 Explain the difference between C-14 and C-12? Both have 6 protons; C-12 has 6 neutrons and C-14 has 8 neutrons.
#3 The identity of an element depends on its atomic number
#4 Electrons located in the outermost energy level valence electrons
#5 How many electrons can be in a 4f sublevel 14
Radioactivity
#1 The radioactive particle with the most mass. alpha particle
#2 When a gamma ray is given off during radioactive decay as a photon
#3 The type of radiation that is most penetrating gamma
#4 When Thorium-234 goes through alpha decay what is produced? Rn-230
#5 When Thorium-234 goes through beta decay and gamma decay what is produced? Pa-234 and a photon
Electrons
#1 What is the electron configuration for He 1s2
#2 Ions of an element contain a different number of electrons
#3 What is the Noble Gas configuration of Fe [Ar] 4s2 3d6
#4 High energy photon gamma ray
#5 When an electron jumps from n=5 to n=2 what color light is emitted? blue light
Final Question