Answer:
Explanation:
In CF4 and NF3, the valence electron groups on the central C and N atoms have a tetrahedral arrangement. The shapes of the molecules are determined by the number of bonding and nonbonding of electrons: since CF4 has four bonded atom(s) and zero lone pair(s) of electrons, the shape is tetrahedral.
If there is a constant loss of 
the concentration of 
will be affected and decrease since 
is a main component of 
.
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BioTeacher101
Most tennis balls are usually hollow, while golf balls are not. Therefore a golf ball contains more mass.
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Francium is an element that melts at room temperature. Francium is a highly reactive element, and only contains one valence electron, which is very ironic in my opinion.
I dont understand , what u write
