why is it that the concentration of the mass of an atom is in the nucleus?

Answer 1

To have the mass anywhere else would be unstable. Throughout nature it is this way.

Consider the earth and the moon.
Consider a solar system.
Generally, there is a lot of mass at the center. The lighter objects whiz around much more actively then the heavier core.

Answer 2

The conventional model of an atom consists of a nucleus containing neutrons and protons surrounded by electrons located in specific orbits or shells. The nucleus is shown as a ball or cluster of particles at the center of the atom. The nucleus is quite small in comparison to the total dimensions of the atom. However, most of the mass of the atom is contained within the nucleus. The components of the atom in the figure below are not drawn to scale. Actually, the electrons in the K, L, and M shells are much smaller than the protons and neutrons that make up the nucleus, and the electrons are located at a much greater distance from the nucleus than shown.

Answer 3

the nuclueus contains protons and neutrons, which are the heaviest parts of the atom. The electrons are outside of the nucleus and have a very small weight, even when compared to the proton and neutron. For exact weights, refer to a chemistry book. When calculating weights, normally electrons are left out because it weights so little. Also, the masses are usually weighed in amu if you look them up (atomic mass units).

Answer 4

Because the nucleus is like the brain of the atom

Answer 5

neutrons r in the nucleus have an atomic mass of 1 AMU

Answer 6

this is so because the nucleus contains neutrons, which contribute to most of the mass number of the atom, and protons which also contributes to the mass number.

Answer 7

in the nucleus there r protons and neutrons which give the atom its mass yet on the outside is the eletron. the eletrons mass is to light even to b considered

Answer 8

Because the neucleus contains both the protons and neutrons. Both of which have a similar mass. The rest is just electrons which have a mass so small that in simple equasions it can be left out.
-Duo

Answer 9

Because if all the mass were floating around with the electrons, it wouldn't be able to use those electrons to bind to other atoms. You couldn't build matter from them, they'd just be like a bunch of little marbles floating around all by their lonesomes.

Answer 10

Because the rest of the atom is just electrons zipping around in a crazy airborn orbit.