Sᴄɪᴇηᴄᴇ Aηᴅ Cᴏᴍᴘᴜᴛᴇʀ Nᴏᴛᴇs™ 🎲

🏝RAMBAAN COMPUTER UPDATED EBOOK 2023 ❈Topic Wise COMPLETE  SUBJECTIVE WITH ONELINER EBOOK  📖 👉Useful For | SSC | BANKING | CENTRAL & STATE Govt  Exams 2023 »2000+ pages(COMPLETE PACKAGE) » English Medium 👇📥 EBOOK LINK📥👇 >>> CLICK HERE <<< 🔰 Download Fast👆 👍Boost your COMPUTER Section 🔰Any Quary Mail us{reply time within 5 minutes } 〰️〰️〰️〰️〰️〰️〰️〰️〰️〰️〰️〰️〰️〰️ 😍Boost your Exam Preparation 👍

🌺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🤞🤞

Some Important Metals and Non-metals  Bronze - Cu + Sn - In making coins, bell and utensils.  German Silver - Cu + Zn + Ni - In making utensils.  Gun Metal - Cu + Sn + Zn + Pb - In making guns, barrels, gears and bearings  Solder - Lead + Tin (Pb + Sn) For soldering.  Bell metal. - Cu + Sn. - For casting bells and statues.  Stainless steel -Fe + Cr + Ni + C. - For making utensils and surgical cutlery.  An alloy in which one of the components is mercury is known as amalgam.