Atoms example sentences

On the basis of this observation August Kekulé in 1865 proposed the following structure for benzene having cyclic arrangement of six carbon atoms with alternate single and double bonds and one hydrogen atom attached to each carbon atom.Elements having similar outer electronic configureurations in their atoms are arranged in vertical columns, referred to as groups or families.Carbon also has unique ability to form p?– p? multiple bonds with itself and with other atoms of small size and high electronegativity.Can you identify 1°, 2°, 3° and 4° carbon atoms in structures I to ? If you go on constructing structures for higher alkanes, you will be getting still larger number of isomers.You have already read that C–C and C–H ? bonds are formed by head-on overlapping of sp3 hybrid orbitals of carbon and 1s orbitals of hydrogen atoms.Is the number of atoms of each element the same on both the sides? If not, then the equation is unbalanced because the mass is not the same on both sides of the equation.Carbon-carbon double bond in alkenes consists of one strong sigma (?) bond (bond enthalpy about 397 kJ mol–1) due to head-on overlapping of sp2 hybridised orbitals and one weak pi (?) bond (bond enthalpy about 284 kJ mol–1) obtained by lateral or sideways overlapping of the two 2p orbitals of the two carbon atoms.One or more hydrogen atoms of alkanes can be replaced by halogens, nitro group and sulphonic acid group.Why is it so ? Has it something to do with their structures and the hybridisation ? You have read that hydrogen atoms in ethyne are attached to the sp hybridised carbon atoms whereas they are attached to sp2 hybridised carbon atoms in ethene and sp3 hybridised carbons in ethane.In that compound, select the element which has the maximum number of atoms.Experiments conducted over a wide range of plants led to the discovery of another group of plants, where the first stable product of CO2 fixation was again an organic acid, but one which had 4 carbon atoms in it.Thus in ethyne, hydrogen atoms can be liberated as protons more easily as compared to ethene and ethane.Due to the weak forces, the first four members, C1 to C4 are gases, C5 to C17 are liquids and those containing 18 carbon atoms or more are solids at 298 K.Carbon atoms have the tendency to link with one another through covalent bonds to form chains and rings.In diamond, each carbon atom is bonded to four other carbon atoms forming a rigid three-dimensional structure.