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Chemistry Review Module Chapter 1
Chemistry Review Module Chapter 1

... • The Modern Model of the Atom – Of course, the Rutherford-Bohr model and the Simplified Model do not perfectly represent what happens inside the atom. No model can! – A more complete model, The Modern or ElectronCloud model exists, but is more complicated and extremely difficult to draw. – The Mode ...
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Chemical Reactions Chapter 11

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Atomic Theory Quiz A

... That’s the most common isotope, Sr-88. Watch your rounding to the nearest whole number work. 6. Name all seven metalloids and write their symbols next to their names (size order, small to large) Boron (B), Silicon (Si), Germanium (Ge), Arsenic (As), Antimony (Sb), Tellurium (Te), and Astatine (At). ...
Matter
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... You should go ahead and practice doing your dot diagrams and Bohr structures for all of the elements from hydrogen to argon. Since argon is the last one, let’s go ahead and practice the dot diagram and Bohr structure together. Argon has an atomic number of 18 and an atomic mass of let’s go ahead and ...
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Which notation represents an atom of sodium
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TOPIC 2. THE STRUCTURE OF ATOMS
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... Note how the electron arrangement in the Na+ ion is the same as for the Ne atom which has atomic number 10, one smaller than the Na atom. All the other members of the first group of elements in Table 2 (the alkali metals) also have just one more electron than a noble gas atom, and they all behave as ...
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AQA GCSE Chemistry My Revision Notes

... (c) There are some advantages of drinking hard water. Give one of them. (1 mark) (d) What happens if you use temporarily hard water in a kettle? (2 marks) (e) Explain how an ion-exchange column softens hard water. (2 marks) (f) Another way of softening hard water is to use sodium carbonate. Explain ...
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Unit 10: Structure and Bonding

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UNIT 2 ATOMS, MATTER, AND THE MOLE
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... there are two atoms of hydrogen. 2. H2O2 is not water. It is called hydrogen peroxide, has two atoms of hydrogen for every two atoms of oxygen and behaves much differently that water. This brings us to the next law. F. LAW OF MULTIPLE PROPORTIONS-states that there can exist two or more compounds wit ...
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electrons - Science Department

... fundamental, meaning that they cannot be broken up into smaller particles. ...
TOPIC 2. THE STRUCTURE OF ATOMS
TOPIC 2. THE STRUCTURE OF ATOMS

... whose atomic number is 1 less than that of the first group element. Some other elements have atoms which only require one more electron in order to obtain the noble gas arrangement. These atoms are F, Cl, Br and I, all of which are just one electron short of having a filled outer level. In chemical ...
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part 3 - instructor version

Electrons
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... a. an electron circles the nucleus only in fixed energy ranges called orbits; b. an electron can neither gain or lose energy inside this orbit, but could move up or down to another orbit; c. that the lowest energy orbit is closest to the nucleus. Describe the wave/particle duality of electrons. Writ ...
ALE 23. Balancing Redox Reactions
ALE 23. Balancing Redox Reactions

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Extended periodic table

An extended periodic table theorizes about elements beyond element 118 (beyond period 7, or row 7). Currently seven periods in the periodic table of chemical elements are known and proven, culminating with atomic number 118. If further elements with higher atomic numbers than this are discovered, they will be placed in additional periods, laid out (as with the existing periods) to illustrate periodically recurring trends in the properties of the elements concerned. Any additional periods are expected to contain a larger number of elements than the seventh period, as they are calculated to have an additional so-called g-block, containing at least 18 elements with partially filled g-orbitals in each period. An eight-period table containing this block was suggested by Glenn T. Seaborg in 1969. IUPAC defines an element to exist if its lifetime is longer than 10−14 seconds, which is the time it takes for the nucleus to form an electronic cloud.No elements in this region have been synthesized or discovered in nature. The first element of the g-block may have atomic number 121, and thus would have the systematic name unbiunium. Elements in this region are likely to be highly unstable with respect to radioactive decay, and have extremely short half lives, although element 126 is hypothesized to be within an island of stability that is resistant to fission but not to alpha decay. It is not clear how many elements beyond the expected island of stability are physically possible, if period 8 is complete, or if there is a period 9.According to the orbital approximation in quantum mechanical descriptions of atomic structure, the g-block would correspond to elements with partially filled g-orbitals, but spin-orbit coupling effects reduce the validity of the orbital approximation substantially for elements of high atomic number. While Seaborg's version of the extended period had the heavier elements following the pattern set by lighter elements, as it did not take into account relativistic effects, models that take relativistic effects into account do not. Pekka Pyykkö and B. Fricke used computer modeling to calculate the positions of elements up to Z = 184 (comprising periods 8, 9, and the beginning of 10), and found that several were displaced from the Madelung rule.
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