which of the following represents the Lewis structure for CI Use the data given
ID: 508370 • Letter: W
Question
which of the following represents the Lewis structure for CI Use the data given below to construct a Born-Haber cycle to determine the bond energy of O_2. A) 426 kJ B) 249 kJ C) 852 kJ D) 498 kJ E) 356 kJ Identify the number of bounding pairs and lone pairs of electrons in water. A) 1 bonding pair and 1 lone pair B) 1 bonding pair and 2 lone pairs C) 2 bonding pairs and 2 lone pairs D) 2 bonding pairs and 1 lone pair E) 3 bonding pairs and 2 lone pairs Define electronegativity. A) the ability of an atom to repel neutrons in a chemical bond B) the ability of an atom to repel electrons in a chemical bond C) the ability of an atom to attract protons to itself in a chemical bond D) the ability of an atom to attract neutrons to itself in a chemical bond E) the ability of an atom to attract electrons to itself in a chemical bond Using periodic trends, place the following bonds in order of increasing ionic character. A) Si-PExplanation / Answer
27 The electrons which are not involved in covalent bond formation are called lone pair electrons, in water 2-bonding pair and 2-lone pair electrons are there.
28. Electronegativity is the tendency of an atom to attract a bonding pair of electrons towards itself. (ans d).
29, Ans-b,
Ionic character arises when there is a electronegativity difference between two atoms.
30. Ans-d
Find the valence electron of all the atoms and add them,
Be-2
F-14
Totla-16
Find the octet electron of all the atoms and add them
B-4
F-16
Total -20
Bonding electrons is 20-16 i.e 4 electrons.
Number of bonds is, = bonding electrons /2 =2
Number of non+bonding electrons = valence electrons - bonding electrons
= 16-4 = 12 = 6 pair of electrons.
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