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(D) The molecular formula of urea is $(NH_2CONH_2)$.To find the total number of electrons,we sum the atomic numbers of all atoms present in the molecu

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$32$

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(D) The molecular formula of urea is $(NH_2CONH_2)$.To find the total number of electrons,we sum the atomic numbers of all atoms present in the molecule:- $N$ (Nitrogen): Atomic number $= 7$,there are $2$ atoms: $2 	imes 7 = 14$.- $H$ (Hydrogen): Atomic number $= 1$,there are $4$ atoms: $4 	imes 1 = 4$.- $C$ (Carbon): Atomic number $= 6$,there is $1$ atom: $1 	imes 6 = 6$.- $O$ (Oxygen): Atomic number $= 8$,there is $1$ atom: $1 	imes 8 = 8$.Total electrons $= 14 + 4 + 6 + 8 = 32$.

List-$A$	List-$B$
$(1)$ Roald Hoffmann	$(A)$ The proportion of the mass of elements in any compound is fixed.
$(2)$ Lavoisier	$(B)$ The smallest indivisible particle of matter is the atom.
$(3)$ Joseph Proust	$(C)$ Chemistry is not the science of $100$ elements.
$(4)$ Dalton	$(D)$ Matter can neither be created nor destroyed.

The number of electrons in one molecule of urea $(NH_2CONH_2)$ is

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