Question

In the given figure,
AB = AC, angleA = angle D
= 90°.
BD = 18 cm and B
DC = 24 cm
А
Calculate the length of AB correct to two
places of decimal. Also, find the perimeter of
quadrilateral ABDC.​

Answer 1

Answer:

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Answer 2

Answer:

Can you define a Lewis structure? Perhaps…let us give it a try…

Lewis structures, or Lewis dot diagrams, are diagrams that depict covalent (and ionic bonding) in small molecules (and ions), such that covalent bonds, formed from 2 electrons, and lone pairs of electrons, are rationally distributed in a molecule or ion.

And the first step in depicting a Lewis structure is counting the number of valence electrons in the participating atoms. And for say sulfate dianion, SO2−4 , we got 5×6+2 electrons, i.e. 16 electron pairs to distribute. Main group elements of the second row typically possess an octet of electrons. And for sulfate….

(O=)2S(−O−)2 the doubly bound oxygens AND the SULFUR each possess 6 valence electrons to give a neutral oxygen centre. And the negatively oxygens each possess 7 electrons to give an oxide anion…hence the dinegative charge…

Try it out for nitrate, NO−3 , which possesses a quaternized nitrogen, and TWO negative charges, and for carbon dioxide, a NEUTRAL species…