1) Atoms are eternal, indivisible, homogeneous,incompressible and invisible.

2) Atoms differ only in shape and size,but not for internal qualities.

3) The properties of matter vary according to thegrouping of atoms.

1) Elements are made up of atoms

2) The atoms of the same element are all the sameeach.

3) Compounds are formed by the union of atoms ofdifferent elements, combined in a simple andconstant forming well-defined entities calledmolecules.

1. A graphical representation showing the pairs ofelectrons in dashes or bond points between atomsof a molecule and the lone electron pairs thatmay exist.

2. This representation is used to know the amount ofvalence electrons of an element that interact withothers or between their own species, forming links eithersingle, double, or triple which are foundclosely related to molecular geometry.

3. They are simple two-dimensional representations of theconnectivity of atoms in molecules; as well asthe position of the bonding and non-bonding electrons.

1. Matter is electrically neutral so, in additioncontain electrons, there must be particles withpositive charges.

2. There was a source of positive charge that neutralized thenegative charge that electrons had.

3. The atom has only a neutral charge.

4.The positive charge was evenly distributedin the atom.

1) The atom has a central nucleus in which it isconcentrated positive charge, and almost all of its mass.

2) In the outer zone (bark) is the loadnegative that is made up of electrons.

3) The nucleus contains protons.

4) The electrons revolve around the nucleus and areseparated from it by a great distance.

1) Atoms that have the same number of electronsof valence and that have different numbers, havesimilar characteristics.

2) Atoms have too small a nucleus anddense containing subatomic particles.

3) Electrons are in different orbitsaround the core.

4) Atoms are electrically neutral, but if they havenegatively charged electrons must contain otherpositively charged particles (protons).

1.Use Coulomb's Law to state that if aelectron is subjected to a force inverselyproportional to the square of the distance, the pathdescribed should be elliptical and not strictly circular.

2.conclude that the energy difference between theelectrons (even though these were in the sameenergy level) was due to the existence of sub-levelsenergy within each level.

3. It was based on Einstein's theory of relativity togive electrons a different treatment, and evaluate theirbehavior depending on the speeds reachedby said fundamental particles.

1.Describe the motion of electrons as wavesstationary.

2.Electrons are constantly moving, that is, notthey have a fixed or definite position within the atom.

3.This model does not predict the location of the electron, nordescribes the path it takes within the atom. Aloneestablishes a probability zone to locate theelectron.

4.These probability areas are called orbitalsatomic. The orbitals describe a motion oftranslation around the nucleus of the atom.