$(a)$ In this crossword puzzle (Fig),names of $11$ elements are hidden. Symbols of these are given below. Complete the puzzle.
$1. Cl$
$2. H$
$3. Ar$
$4. O$
$5. Xe$
$6. N$
$7. He$
$8. F$
$9. Kr$
$10. Rn$
$11. Ne$
$(b)$ Identify the total number of inert gases,their names,and symbols from this crossword puzzle.
$1. Cl$
$2. H$
$3. Ar$
$4. O$
$5. Xe$
$6. N$
$7. He$
$8. F$
$9. Kr$
$10. Rn$
$11. Ne$
$(b)$ Identify the total number of inert gases,their names,and symbols from this crossword puzzle.
(A) The completed crossword puzzle reveals the names of the $11$ elements: Chlorine $(Cl)$,Hydrogen $(H)$,Argon $(Ar)$,Oxygen $(O)$,Xenon $(Xe)$,Nitrogen $(N)$,Helium $(He)$,Fluorine $(F)$,Krypton $(Kr)$,Radon $(Rn)$,and Neon $(Ne)$.
$(b)$ Inert gases (Noble gases) are elements that have a stable electron configuration. From the given crossword,there are $6$ inert gases present: Helium $(He)$,Neon $(Ne)$,Argon $(Ar)$,Krypton $(Kr)$,Xenon $(Xe)$,and Radon $(Rn)$.
$(b)$ Inert gases (Noble gases) are elements that have a stable electron configuration. From the given crossword,there are $6$ inert gases present: Helium $(He)$,Neon $(Ne)$,Argon $(Ar)$,Krypton $(Kr)$,Xenon $(Xe)$,and Radon $(Rn)$.
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Similar Questions
Write the chemical formulae for the following substances and calculate the molecular mass for each one of them:
$(a)$ Caustic potash
$(b)$ Baking soda
$(c)$ Limestone
$(d)$ Caustic soda
$(e)$ Ethanol
$(f)$ Common salt
$(a)$ Caustic potash
$(b)$ Baking soda
$(c)$ Limestone
$(d)$ Caustic soda
$(e)$ Ethanol
$(f)$ Common salt
Medium
View Solution$(a)$ Calculate the mass of $0.5$ mole of oxygen atoms.
$(b)$ Calculate the number of molecules of glucose present in its $90 \ g$ (molecular mass of glucose is $180 \ u$). (Avogadro constant $= 6.022 \times 10^{23} \ mol^{-1}$)
$(c)$ Calculate the number of moles of water in $2 \ g$ of water.
(Atomic mass of $H = 1 \ u, O = 16 \ u$)
$(b)$ Calculate the number of molecules of glucose present in its $90 \ g$ (molecular mass of glucose is $180 \ u$). (Avogadro constant $= 6.022 \times 10^{23} \ mol^{-1}$)
$(c)$ Calculate the number of moles of water in $2 \ g$ of water.
(Atomic mass of $H = 1 \ u, O = 16 \ u$)
Medium
View Solution$(a)$ What are molecules? Using examples, differentiate between the molecules of an element and a compound.
$(b)$ Derive the chemical formulae of the molecules formed between the following ions:
$(i)$ $Al^{3+}$ and $SO_{4}^{2-}$
$(ii)$ $Ba^{2+}$ and $NO_{3}^{-}$
$(b)$ Derive the chemical formulae of the molecules formed between the following ions:
$(i)$ $Al^{3+}$ and $SO_{4}^{2-}$
$(ii)$ $Ba^{2+}$ and $NO_{3}^{-}$
Medium
View SolutionFill in the missing data in the Table.
Species property $H_2O$ $CO_2$ $Na$ atom $MgCl_2$ No. of moles $2$ - - $0.5$ No. of particles - $3.011 \times 10^{23}$ - - Mass $36 \, g$ - $115 \, g$ -
| Species property | $H_2O$ | $CO_2$ | $Na$ atom | $MgCl_2$ |
| No. of moles | $2$ | - | - | $0.5$ |
| No. of particles | - | $3.011 \times 10^{23}$ | - | - |
| Mass | $36 \, g$ | - | $115 \, g$ | - |
Medium
View SolutionVerify by calculating that:
$(a)$ $5$ moles of $CO_2$ has a higher mass than $5$ moles of $H_2O$.
$(b)$ $120 \, g$ of calcium and $120 \, g$ of magnesium elements have a mole ratio of $3:5$.
$(a)$ $5$ moles of $CO_2$ has a higher mass than $5$ moles of $H_2O$.
$(b)$ $120 \, g$ of calcium and $120 \, g$ of magnesium elements have a mole ratio of $3:5$.
Medium
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