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Atomic Structure and Periodic Table Quick Notes
Atomic Structure and Periodic Table Quick Notes

... (making it Neutrally Charged) Two types of Atoms: Ions- these are atoms that have LOST or GAINED an ELECTRON during a chemical reaction  If an atom loses an electron, it becomes a Positive Ion  If an atom gains an electron, it becomes a Negative Ion Ex: when Na reacts with Cl to form NaCl, the Na ...
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11/13 atoms powerpoint

...  Atoms cannot be subdivided, created, or destroyed  Atoms of different elements combine in simple whole-number ratios to form chemical compounds  In chemical reactions, atoms are combined, separated, or rearranged ...
Chapter 4: Introduction to Earth Chemistry Section 1 Notes
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... Based on similarities in their _____________ properties, elements on the periodic table are arranged in columns, which are called ___________. An atom’s chemical properties are largely determined _________________________________________ _____________________________. These electrons are called ____ ...
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... (a) Electron affinities decrease going down the group (from smaller to larger elements). (b) Ionization energies decrease going down the group (from smaller to larger elements). (c) Chemical reactivity decreases going down the group (from smaller to larger elements). (d) The second ionization energy ...
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Chocolate Challenge - Waterford Public Schools

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... The Elements o If a pure substance cannot be decomposed (at the macroscopic level ) into something else, then the substance is an element. o There are 118 Elements Known o Each element is given a unique chemical symbol (one or two letters). o Elements are Building Blocks of Matter. o Chemical symbo ...
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Atomic Timeline - Ms Brown`s Chemistry Page

... • John Dalton formulated the Atomic Theory which states that: atoms of an element are different than atoms of other elements; atoms of one element are the same; that atoms of different elements can be combined; that atoms cannot be divided or separated; and that elements are made of tiny particles c ...
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4 1 introduction to atoms 65-68

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Dmitri Mendeleev

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Chemistry Final Study Guide

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... Compounds are pure substances that contain two or more elements combined together in fixed (or definite) proportions. Water is an example of this law. Pure water always contains 11% Hydrogen and 89% Oxygen. Law of Multiple Proportions states that the masses of one element, which combine with a fixed ...
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SECTION 3.1 Atomic Structure

... The last are the d orbitals, which occur 5 ways in space and the f orbitals, which occur 7 ways in space.  Each orbital can only hold 2 electrons  Electrons will occupy the lowest energy levels first, which mean they occupy orbitals with the lowest energy.  Orbitals are occupied in this order: s ...
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Atomic Structure Test Review

... is 14, and so on until the p orbitals are full with 6. These are group 18. The entire energy level is full. That is why noble gases are unreactive. If there are s and d, it is a d-block metal. ...
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Name: Date: Period: Who is the Father of Atomic Theory? What

... Characteristics of Elements: 5. Fill in the following descriptions of nonmetals: Location on the Periodic Table: Characteristics of Elements: 6. Fill in the following descriptions of metalloids: Location on the Periodic Table: Characteristics of Elements: 7. Can “groups be described as columns (↕) o ...
study guide - atomic srtucture/_classification of matter
study guide - atomic srtucture/_classification of matter

... idea that all things were made of particles too small to see. He was laughed at. In the 1800’s John Dalton proposed the idea of the “Atomic Theory”. He had 5 theories, 3 of which are still believed today. They are: 1. All matter is composed of extremely small particles too small to see 2. In reactio ...
< 1 ... 183 184 185 186 187 188 189 190 191 ... 256 >

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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