2023-02-21 09:25:00
Modern Periodic Table: Common Sense
✺ The modern periodic table was recreated by Henry Moseley (1913 AD).
✺ The modern periodic table is also called the long form of the periodic table.
✺ Periodic Law of the Modern Periodic Table - "The chemical and physical properties of elements are periodic functions of their atomic numbers."
✺ In modern periodic table :
➭ Period - 7
➭ Square - 18
There are 4 blocks in the periodic table:
➭ s Block - Alkali and Alkaline Earth Metals
➭ p Block - Representative Elements and Main Elements
➭ d block - transition elements
➭ f block - inner transition elements
✺ The zigzag staircase line drawn below B, As, As, Te and At in the periodic table forms the boundary between metals and non-metals, these elements are also called metalloids.
✺ Merits of Modern Periodic Table:
⇈ - increases
⇊ - decreases
➭ size of atom
➛ From top to bottom in the class - ⇈
➛ From left to right in a period - ⇊
➭ ionization energy
➛ Top to bottom in class - ⇊
➛ From left to right in a period - ⇈
➭ Ionization Enthalpy
➛ Top to bottom in class - ⇊
➛ From left to right in a period - ⇈
➭ electron gain enthalpy
➛ Top to bottom in class - ⇊
➛ From left to right in a period - ⇈
➭ Electrical Debt
➛ Top to bottom in class - ⇊
➛ From left to right in a period - ⇈
➭ Metallic Properties
➛ From top to bottom in the class - ⇈
➛ From left to right in a period - ⇊
➭ Nonmetallic Properties
➛ Top to bottom in class - ⇊
➛ From left to right in a period - ⇈
✺ In the modern periodic table, atomic numbers from 57 to 71 are called lanthanoid series and atomic numbers from 89 to 103 are called actinoid series.
✺ Generally oxides of metals are basic and oxides of non-metals are acidic.
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