Many times, solutions lie between two quantities, rather than continuing endlessly in one direction. For example systolic (top number) blood pressure that is between 120 and 139 mm Hg is called borderline high blood pressure. This can be described using a compound inequality, b < 139 and b > 120. Other compound inequalities are joined by the word “o
Answer:
has an atom with incomplete octet
Explanation:
H atoms are generally excluded from octet rule as H atom has only one 1s orbital which can contain maximum two electrons.
At first, lewis structures of all molecules should be drawn. Then octet of an atom is determined by taking summation of all nonbonding electrons along with all bonding electrons corresponding to that atom.
If this summation is less than 8 then it is said that the atom has incomplete octet.
In , B atom has no nonbonding electons (i.e. lone pair). B atom is attached to three F atoms via three single bonds. Then total number of electrons corresponding to B atom are 6 ( one bond contains two electrons).
All other atoms (except H) in given molecules has complete octet.
So, has an atom with incomplete octet.
Lewis structures are shown below.
Answer:
It's the oesophagus.
Explanation:
The worm digestive system consists of the pharynx, the esophagus, the crop, the intestine and the gizzard. The oesophagus is not mentioned. Thus, it's not part of the worm digestive system.
Answer:
Once ignited, a ribbon of magnesium metal burns freely in air to form solid magnesium oxide in the form of a white powder. The reaction is plainly spontaneous even though ΔS is negative.
