Answer: BF3
Explanation: boron needs 4 electron to obtain octet and Fluorine has just one. For the valence shell to be completely filled it will have to form BF4- with 4 fluorine atom surrounding it.
We shall consider V, the volume and T, the temperature.
According to Boyle's Laws:

In our case:
Answer:
Conservation of mass can be checked in an experiment . There are three steps to do it in a best way:
1. Weigh all the equipment and materials required in the experiment before the experiment.
2. Avoid spillage and evaporation during the experiment.
3. Weigh all the equipment and materials after the experiment.
If the mass is conserved then weight from step 1 is equal to weight from step
<span>A<span>X5</span><span>E0</span></span> - trigonal bipyramidal - zero lone pairs;
<span>A<span>X4</span><span>E1</span></span> - seesaw - 1 lone pair;
<span>A<span>X3</span><span>E2</span></span> - T-shaped - 2 lone pairs;
<span>A<span>X2</span><span>E3</span></span> - linear - 3 lone pairs;
The only option that matches is trigonal bipyramidal.
Answer:
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