what is differentiate of pentavalent and trivalent atom?
97485
Pentavalent atoms theoretically require something other than Hydrogen to stay electrcally neutral.Again theoretically Trivalent atoms can not stay electrically neutral.
531279
monatomic elements don't have molecular structures, molecules do.  your question is therefore confusing.\n\nelements have different isotopes (more or less neutrons)\n\nmolecules have different isomers (same number of elements, just connected differently)
836124
Na has one dot\nNa+ has no dots\nH20 has 2 lone pairs around the oxygen and the H's each share a pair with the O\n\nOH has two shared between the O and H, two lone pairs around the O, and an "extra" electron at the O as well, this extra gives the - charge\n\nH2 share two electron like this H..H
40150
The atomic # of the element is the # of protons and (some times electrons) in the element
548540
Ionic bonds are comprised of a metal and a non-metal.\nCovalent bonds are comprised of two bonded non-metals.
739878
I am not sure what you are asking but the answer could be a monoatomic ion. The positive being a cation and the negative being an anion.\n\nYou might ask over at http://forums.mychemistrytutor.com though.
412159
Elements differ primarily by number of protons.  An atom containing one proton, for example, is always called hydrogen.  Protons are contained in the nucleus along with neutrons.  Electrons "orbit" the nucleus  ("orbiting" isn't a correct way to describe the electron quantum mechanical sense, but it's more-or-less helpful to think of it this way).  Protons have a positive charge, electrons a negative charge and neutrons a neutral one.\n\nElements may also vary within themselves.  Some forms of elements have more neutrons than others.  These are called isotopes of each other and have different masses.  They're referenced by their mass numbers such as "Carbon-14" or "Carbon-12".  Here Carbon-14 has two "atomic mass units" (amu) more mass than carbon 12.  Each proton and each neutron contributes one amu to the mass so carbon 1-4 has two more neutrons than carbon-12.\n\nElements may also vary by electronic species.  When neutrally charged, the same number of electrons "orbit" the nucleus as there are protons in the nucleus.  Sometimes atoms either gain or lose some electrons to become negatively or positively chaged overall (as opposed to neutral where the positive proton charges cancel exactly the negative electron charges).  These are called "ionic species" or simply "ions".
916474
An atom has equal numbers of protons (+ charged) and electrons (- charged) making them neutral. \n\nAn ion has either gained or lost electrons (only those in its' outer shell [valence]) giving them a + or a - charge. \n\nGet an "A".
634552
an ion with both acidic and basic part
347735
1)ionic and covalent depend on the situation and are considered generally equal \n2)network bonds are a type of covalent bond\n3)metallic bonds are weaker (this one's kinda fuzzy)\n4)intermolecular are the weakest
851578
It would be either an isotope or an ion depending on the number of neutrons or electrons in the atom.\nA good example of this for isotopes is hydrogen:\nWhen there is no neutrons it is H1 or just plain hydrogen\nWhen there is 1 neutron it is Deuterium or H2 also called heavy hydrogen\nWhen there is 2 neutrons it is called tritium or H3\n\nIf the only difference is the addition or removal of one or more electrons it is an Ion.
170267
An atom is the smallest unit of any observable thing you can have. Atoms make up almost everything we can see.\n\nIt's name is Greek for 'Indivisable' but we have since found that atoms are made of protons, neutrons and electrons (and the first two are made of even smaller particles).\n\nAn element is a substance that is entirely comprised by only one type of atom. Gold, Tin and Oxygen are elements because they are made entirely of Gold, Tin and Oxygen atoms.\n\nMolecules and Compounds are similar in that they are made up of two or more atoms of different elements in a precise and defined ratio. Atoms in compounds can be ionically bonded. Molecules are, generally, covalently bonded.
884906
the measure of an element 2 combine with other is called VALENCY.to work out the valenceys for certain chemicals we havta see the no. of atoms in outer & inner orbits..>>&then use the formula>>.hope it'll help u.
151430
A proton, neutron, and electron is what makes up an atom.  a molecule however is defined as two or more atoms linked by chemical bonds which are linked atom.  Covalent bonds consist of shared pairs of electrons Electronegativity: unequal sharing of electrons...U can find more info on askjeeves.com
863219
Electronegativity is a measure of the ability of an atom or molecule to attract electrons in the context of a chemical bond. The type of bond formed is largely determined by the difference in electronegativity between the atoms involved. Atoms with similar electronegativities will share an electron with each other and form a covalent bond. However, if the difference is too great, the electron will be permanently transferred to one atom and an ionic bond will form. Furthermore, in a covalent bond if one atom pulls slightly harder than the other a polar covalent bond will form.\n\nThe Pauling scale was devised in 1932 by Linus Pauling. On this scale, the most electronegative chemical element (fluorine) is given an electronegativity value of 3.98 (textbooks often state this value to be 4.0); the least electronegative element (francium) has a value of 0.7, and the remaining elements have values in between. On the Pauling scale, hydrogen is arbitrarily assigned a value of 2.1 or 2.2.\n\n'ΔEN' is the difference in electronegativity between two atoms or elements. Bonds between atoms with a large electronegativity difference (greater than or equal to 1.7) are usually considered to be ionic, while values between 1.7 and 0.4 are considered polar covalent. Values below 0.4 are considered non-polar covalent bonds, and electronegativity differences of 0 indicate a completely non-polar covalent bond.\n\nHope I helped!...\n
695264
Oxidation numbers: tell which atoms lose or gain electrons in chemical reactions, they can be determined by electronegativity\n\nThis web-site lays it out for you and gives examples.\n\nhttp://st19.startlogic.com/~honorsph/honorsphysicalscience/chemical%20formulas/writing_formulas.htm
915836
A compound contains more than one element (H2O).  A molecule may contain atoms of one element only (O2).