What is scientific definition of Atom?

Answer 1

AnswerAn atom is a term we apply to a structure composed of protons, electrons and neutrons. It's a basic "unit" of matter, and it has a structure that is determined largely by the electromagnetic force (with a bit of help from the strong and weak nuclear forces and from gravity).

An atom has a highly dense nucleus where a proton or protons and a neutron or neutrons are found (save hydrogen-1, which has a lone proton). Most of the mass of the atom is concentrated here. Electrons, which form a "cloud" around but distant from the nucleus, determine an "outer boundary" of this structure. It is the negative electrical charge on electrons that causes them to be "pulled and held" by the positively charged protons in the nucleus. Further, the electrons, which are have something on the order of 1/1800th the mass of a proton, are always in motion about the nucleus.

There is a lot more to the structure of atoms and how different numbers of protons, neutrons and electrons determine how an individual atom behaves, and how it interacts with other atoms around it. This fundamental knowledge is usually encountered in an introduction to the science of chemistry. A link can be found below for more information, and to the investigator who is using this question and answer as a gateway to knowledge, welcome to the way the world really works.

Answer 2

atom is a smallest particle of an element

An atom in science is the smallest particle of an element that has the properties of the element.

Answer 3

an atom is defind the smallest element of the world which can exist, it can not be broken down in to simpler substances by chemical reactions.

Answer 4

The scientific term for an atom is basicly that the atom is the smallest particle possible and can't be broken down any further.