How many electrons and neutrons are present in the symbol 2713Al3+?

Atomic no. (Z) = 13 and atomic mass (A) = 27
No. of neutrons = A-Z = 27 - 13 = 14
No. of electrons = 13 - 3 = 10

Al atom loses 3e^- to form Al⁺³.

What is Avogadro's Law? 

Avogadro's law states that "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules." For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant.

Why are fishes reasonably safe during electric storm?

Basically lightning stays more on the surface of the water rather than penetrating it. That's because water is a reasonably good conductor, and a good conductor keeps most of the current on the surface.

But, fish under a lightning strike can be killed, if it's close enough to the surface.

Cars have a warning on external rear view mirrors saying "Objects are closer than they appear in the mirror." Explain why the warning is there.

A car has a convex mirror because a convex mirror placed on the passenger side reduces the driver's blind spots on that side of the vehicle by presenting a wider field of view, but it also makes other cars appear farther away due to a slight distortion caused by the shape. The flatter mirror on the driver’s side produces a more accurate depiction of what’s behind the car but with a more narrow field of view. But while driving wider view is preferential so the mirror is curved. ...

How many components can be realized of a vector?

Any vector directed in two dimensions can be thought of as having two different components. The component of a single vector describes the influence of that vector in a given direction.

2. who proposed the word "domain" in three domain system ?

Does a nucleus contain electrons ? Explain .

No, a nucleus does not contain electrons. Electrons are negatively charged subatomic particles that orbit the nucleus in specific energy levels or electron shells. The nucleus, on the other hand, is the central region of an atom that contains protons and neutrons tightly bound together. Protons are positively charged particles, and neutrons have no charge. The number of protons determines the atomic number of an element and defines its identity, while the number of neutrons can vary to form...