Answer:
n= | Shell | Maximum Number of Electrons
1 | 1st Shell | 2
2 | 2nd Shell | 8
3 | 3rd Shell | 18
4 | 4th Shell | 32
Explanation: cause :)
Answer:
NH3 < NF3 < BCl3
Explanation:
The vapour pressure of a substance has something to do with the nature of intermolecular forces between its molecules. If the molecules of a substance are held together by strong intermolecular forces, the substance will display a low vapour pressure at a given temperature and vice versa.
Ammonia has the lowest vapour pressure because of strong intermolecular hydrogen bonds that hold its molecules together.
Answer:
May be the answer is C. Coal is being used faster than it is being produced
Answer:
Because due to the presence air resistance
Answer: A large longwall mine
Explanation: Due to the depth of a large longwall mine it is easier for it develop stress which leads to a failure (burst). The leading cause of rock bursts in underground mining is usually the mining-triggered variation of the stress field. In most cases a rock burst has no direct relation with a blast nearby.
A large burst can be detected by a seismic system easily, while a small rock burst cannot be picked-up by a seismic system.
However the size of the burst it's occurrence is always dangerous to minners working near that location of burst.
