Aneutral atom possesses an atomic number of 13 and an atomic mass of 27 . three electrons are lost . from what region of the atom are they lost ?

The correct answer to the question is from outer region or the valence shell.

EXPLANATION:

As per the question, the atomic number of the element  Z = 13.

The mass number of the element A = 27

The element whose atomic number 13 and mass number 27 corresponds to Aluminium.

The electronic configuration of Aluminium is .

Hence, the valence shell of the Aluminium i.e M- shell contains three electrons.

The electrons present in the valence shell are loosely bound to the nucleus. These electrons can be easily escaped from the outer shell when they are excited by providing a little bit of energy from any external source. The innermost electrons are tightly bound to the nucleus.

As per the question, three electrons are lost from the neutral atom of Aluminium. These three electrons are lost from the valence shell or the outer region of the atom as they are loosely bound to the nucleus.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me