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🌺PERIODIC TABLE MOST ASKED QUESTION IN EXAMS🌺 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🔻🔻Most abundant element on earth's crust - Oxygen 🔺🔺Most abundant metal in earth's crust - Aluminium 🔻🔻Most abundant metalloid in earth's crust - Silicon 🔺🔺Most abundant element in atmosphere - Nitrogen 🔻🔻Most abundant element in the universe - Hydrogen 🔺🔺Most abundant element in human body - Oxygen 🔻🔻Most abundant gas in atmosphere - Nitrogen 🔺🔺Most abundant element in sea water - Chlorine 🔻🔻Most abundant element in moon's surface - Titanium 🔺🔺Most abundant metal present in human body and bones - Calcium 🔻🔻Most abundant metal compound in bones - Calcium phosphate 🔺🔺Most abundant compound on earth's surface - Water (H2O) 🔻🔻Most abundant compound in sea water - Sodium Chloride 🔻🔻Second most abundant compound in sea water - Magnesium Chloride 🔺🔺Most chemically reactive element - Fluorine 🔻🔻Second most chemically reactive element - Chlorine 🔺🔺The lightest and simplest element - Hydrogen 🔻🔻The lightest metal - Lithium 🔺🔺The rarest element in the earth - Astatine 🔻🔻The heaviest element - Osmium 🔺🔺The heaviest gaseous element - Radon 🔻🔻First man made element - Technetium 🔺🔺Most stable element - Lead 🔷🔷The periodic table is divided into 4 main blocks 👉👉*S block - elements of group 1 and 2 👉👉*P block - elements of group 13 to 18 👉👉*D block - elements of group 3 to 12 👉👉*F block - Lanthanides and Actinides ☂️☂️*The shortest period of the periodic table 🍁🍁Ans : First period ☂️☂️The longest period of the periodic table 🍁🍁Ans : Sixth period ☂️☂️Elements with atomic number 57-71 are known as 🍁🍁Ans : Lanthanides (rare earths) ☂️☂️Elements with atomic number 89-103 are known as 🍁🍁Ans : Actinides (radio active rare earths) ☂️☂️Total number of elements in periodic table 🍁🍁Ans : 118 ☂️☂️The number of naturally occurring elements 🍁🍁Ans : 92 #IMPORTANT_FOR_COMING_EXAMS🤞🤞 🏝🏝© Join Now:: @Ssc_RailwayExams_preparation

🏝🏝TOP SCIENCE 🏝🏝 ☂️☂️1st noble gas group in the periodic table Ans : Helium ☂️☂️*Second lightest element Ans : Helium ☂️☂️*The element shows highest thermal conductivity Ans : Helium ☂️☂️*2nd most abundant element in universe Ans : Helium ☂️☂️*Product of nuclear fusion Ans : Helium 4 ☂️☂️*Discovered by Ans : Pierre Janssen and Norman Lockyer ☂️☂️*Liquid Helium is used as Ans : Cryogenic refrigerant ☂️☂️*Preferred for filling the weather balloons and air ships ☂️☂️*The elements used for the treatment of Asthma Ans : Helium and Oxygen ☂️☂️*The elements used in welding are Ans : Helium and Argon ☂️☂️*Helium is non-inflammable in nature #REVISION

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