ATOMIC STRUCTURE PERIODIC SYSTEM AND [OF] ELEMENT

Atom
Atom [is] smallest particle [is] which still measure up to unsure which compiling of. Atom own very small size measure so that cannot be seen with naked eye. But all man of science able to determine size measure and nature of atom [of] pursuant to research which they [do/conduct]. Estimate hit atom picture referred [as] [by] a atom model. Because research hit atom model [done/conducted] step by step, hence model this atom experience of several times the completion or experience of growth.


Growth Model Atom

Model atom made to water down in learning the nature of atom. Model atom always experience of renewal. This [is] happened [by] because science hit atom non-stoped to expand. Can be said that [by] model of atom [do] not emerge at once, but always there [is] completion [of] along with science growth.
Model acceptable atom by erudite society if supported with data [of] result of experiment. This data have to can just be repeated by whom, just where, and any time. Become the data unattached by space and time.
One who first make model of atom [is] John of Dalton so that the model which he propose referred [as] [by] model of Dalton atom. [Is] hereinafter completed by Thomson, Rutherford, Bohr.

Model Dalton Atom
Atom Word [is] first time proposed by so called Greek philosopher [of] Democritus ( 460-370 SM). According to Democritus, items which cannot dibelah continuously. [His/Its] intention, items bisection will reach a[n storey;level [of] where the items indiscrete again. indiscrete again That shares referred [as] with Atom. This Word come from Greek atomos; a = [do] not and atom tomos = divisible.
Concept [of] soft rice [of] atom Democritus [of] during some century forgotten [by] a people. In the year 1803, John Dalton ( 1776-1844) proposing postulate hit atom. This postulate [is] proposed [by] pursuant to quantitative measurement from chemical reaction. Fill Dalton postulate shall be as follows

a. Items lapped over [by] for a number of indiscrete small particle again. That particle [is] referred [as] [by] a atom
b. Atom [of] a[n unsure identik in all matter, good [of] volume, form, and also [his/its] mass and differ from compiler unsure atom [of] other;dissimilar
c. In chemical change, happened [by] [of] atom dissociation or affiliation. Hereinafter that atom [is] re-arranged so that form certain composition
d. Atom can joint forces with other;dissimilar atom to form a[n molecule with circular comparison number and modestly.

First Dalton Postulate assure opinion Democritus expressing items division will reach a[n particle which cannot be redistributed. That particle [is] so-called with atom
Postulate of Second represent new idea from Dalton. According to Dalton, atom represent smallest shares from a[n element which still measure up to that unsure.
Relied on [by] Third postulate [of] hokum convert mass from Lavoisier, that is in chemical reaction [of] mass of Iihat vitamin [do] not change. [His/Its] intention [is] mass of Iihat vitamin [of] before and hereafter react [is] of equal. So that the atom nothing that disappear or created in a[n chemical reaction. Equally, change that happened only in the form of dissociation and affiliation [of] [among/between] atom.
Fourth postulate represent molecule concept, that is [among/between] atom can join to form molecule. Atom joining to earn of a kind or [do] not of a kind. If affiliation with atom of a kind will form element molecule. If joining atom which [do] not of a kind will form compound molecule. In everyday use, term of molecule of element and molecule of compound [is] enough writed [by] element and compound.