Periodic Table. Everything has its place
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1 Periodic Table Everything has its place
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6 Organization of the Periodic Table The modern periodic table has many important features and characteristics. Elements are organized in order of increasing atomic number, yet spaced so that elements with similar physical and chemical properties are aligned in columns.
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8 Hydrogen A unique element with many physical properties of non-metals but chemical properties of metals
9 Alkali Metals Soft, silver-coloured elements Solids at room temperature Exhibit metallic properties React violently with water to liberate hydrogen gas React with halogens to form compounds such as sodium chloride, NaCI (s) Stored under oil or in a vacuum to prevent reaction with air
10 Alkaline Earth Metals Light, very reactive metals Solids at room temperature Exhibit metallic properties React with oxygen to form oxides with the general chemical formula, MO (s) All except beryllium will react with hydrogen to form hydrides React with water to release hydrogen
11 Halogens May be solids, liquids, or gases at room temperature Exhibit non-metallic properties Not lustrous and non-conductors of electricity Extremely reactive, especially fluorine react readily with hydrogen and metals
12 Noble Gases Gases at room temperature Low melting and boiling points Extremely unreactive, making them especially interesting to chemists krypton, xenon, and radon reluctantly form compounds with fluorine Radon is radioactive
13 Transition Metals Exhibit a range of chemical and physical properties Strong, hard metals with high melting points Good conductors of electricity Variable reactivity Form multivalent ions Many react with oxygen to form oxides Some react with acids to release hydrogen gas
14 lanthanides: elements with atomic numbers 57 to 70 actinides: elements with atomic numbers 89 to 102 transuranic elements: synthetic (not naturally occurring) elements with atomic number 93 or greater (beyond uranium)
15 Metals and non-metals are separated on the table by a zigzag staircase' The elements right next to this line, on either side of it, are metalloids.
16 Each vertical column on the periodic table is called a group (or family) of elements. A horizontal row on the periodic table is referred to as a period. The periodic law states that we can observe periodic trends when the elements are arranged in order of increasing atomic number.
17 As we move across a period from left to right, we observe trends in reactivity. Specifically, we see that elements in Group 1 are highly reactive, then reactivity decreases as we move to the right. Reactivity starts to increase again after Group 14, rising as we reach the halogens and then dropping rapidly at the noble gases. We can use these trends to predict elements' properties.
18 Lewis Symbols Bohr-Rutherford diagrams are useful for representing the number of electrons in an atom. However, they are quite tedious to draw. G.N. Lewis, an American chemist, devised a shorthand system for representing elements.
19 A Lewis symbol shows only the chemical symbol and dots representing the valence electrons around the chemical symbol. (also known as electron dot diagram.)
20 Periodic Trends Atomic Radius A measurement of the size of an atom, usually expressed in picometres (1 pm = 1 x m) The distance from the centre of an atom to the outermost (valence) electrons Every electron in an atom experiences a force of attraction toward the nucleus, known as the effective nuclear charge.
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22 Ionic Radius A measurement of the size of an ion, usually expressed in picometres (pm) The distance from the centre of an ion to the outermost electrons
23 Ionization Energy the quantity of energy required to remove an electron from an atom or ion in the gaseous state
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25 Electron Affinity The energy change that occurs when an electron is added to a neutral atom in the gaseous state
26 Periodic Trends -Summary
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