Essay on Periodic Table and Atomic Numbers

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1) Periodic law: The physical and chemical properties of the elements are periodic functions of their atomic numbers
2) Periodic table: An arrangement of the elements in order of their atomic numbers so that elements with similar properties fall in the same column, or group
3) Lanthanide: The 14 elements with atomic numbers from 58 (Cerium, Ce) to 71 (lutetium, Lu)
- Shiny metals, about the same reactivity as group 2
4) Actinide: 14 elements with atomic numbers from 90 (thorium, Th) to 103 (lawrencium, Lr)
- Radioactive
5) Alkali metals: Located in group 1 (Li, K, Cs,Na) -soft and silvery, react vigorously especially with water.
6) Alkaline-earth metals: Alkaline-Earth Metals Located in group 2 (Mg, Ca, Sr, Ba) -harder and denser than group 1, yet still reactive
7) Transition elements: d-block elements that are metal with typical metallic properties.
8) Main-group elements: The elements in the s-block or p-block.
9) Halogens: Located in group 17 (F,Br,Cl,I) - Most reactive non-metals, react with most metals to make salt, 7 valence electrons
10) Atomic radius: 1/2 the distance between the nuclei of identical atoms that are bonded together.
11) Ion: An atom or group of bonded atoms that has a positive or negative charge
12) Ionization: The formation of ions from the solute molecules by the action of the solvent. Any process that results in the formation of an ion.
13) Ionization energy: The energy required to remove one electron from a neutral atom of

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