Why do some atoms need two or three covalent bonds?

What kind of bond holds together the atoms within the molecule?

Chemical bonds hold together the atoms within a molecule. The most common types of chemical bonds are covalent bonds and ionic bonds. Covalent bonds involve the sharing of electrons between atoms, while ionic bonds involve the transfer of electrons from one atom to another.

Need an example of covalent bonds?

Any molecule with two non metal atoms (HCl, HF or O2 as examples) form a covalent bond between the bonding atoms.

What type of bond hold H2O atoms together?

A covalent bond holds the H2O atoms together. In a water molecule, oxygen and hydrogen atoms share electrons to form covalent bonds, resulting in a stable compound.

What type of bonds are in organic compounds?

Organic compounds typically contain covalent bonds. These bonds involve the sharing of electrons between atoms to form a stable molecular structure. Covalent bonds are commonly found in organic molecules due to the need to achieve a stable electron configuration.

Why do atoms need to form covalent bonds or become ions?

Because they need 8 valecne electorns, and some don't so they share or transfer. :)

How does an atom share electrons?

Sharing electrons occurs when atoms have a covalent bond. Covalent bonds occur between non-metals and there are two types of covalent bonds: Polar and Nonpolar Covalent bonds. Polar covalent bonds are when there is an unequal sharing of electrons which causes the atom that occupies the electron(s) more to have a slightly negative charge while the atom that occupies the electron(s) less has a slightly positive charge. Nonpolar covalent bonds basically have equal sharing of the electron(s). Atoms bond because they need to become stable like the noble gases. *find out about the octet rule*

Why does chlorine melt at -100 degrees but need 1000 degrees to split molecules to atoms?

Chlorine molecules (Cl2) have of strong covalent bonds between the two Cl atoms. The bonds between one MOLECULE and another however are much weaker.

Is sulphur and carbon an ionic or a covalent bond?

A bond between sulphur and carbon is covalent. In covalent bonds, atoms share electrons to achieve a stable electron configuration. Ionic bonds involve the transfer of electrons between atoms of different electronegativities.

Why fourth covalent bond is not formed?

A fourth covalent bond is not formed because atoms are limited in the number of electrons they can share to achieve stability. In most cases, atoms are most stable when they have a full outer electron shell, typically with 8 electrons (octet rule). Once an atom has formed three covalent bonds, it usually has achieved a full outer shell and does not need to form a fourth bond.

Why do atoms need to form covalent bonds?

Covalent Bond Force holding atoms in a molecule together as a specific, separate entity (as opposed to, e.g., colloidal aggregates; see bonding). In covalent bonds, two atoms share one or more pairs of valence electrons to give each atom the stability found in a noble gas. In single bonds (e.g., H-H in molecular hydrogen), one electron pair is shared; in double bonds (e.g., O=O in molecular oxygen or H2C=CH2 in ethylene), two; in triple bonds (e.g., HCºCH in acetylene), three. In coordinate covalent bonds, additional electron pairs are shared with another atom, usually forming a functional group, such as sulfate (SO4) or phosphate (PO4). The number of bonds and the atoms participating in each (including any additional paired electrons) give molecules their configuration; the slight negative and positive charges at the opposite ends of a covalent bond are the reason most molecules have some polarity (see electrophile; nucleophile). Carbon in organic compounds can have as many as four single bonds, each pointing to one vertex of a tetrahedron; as a result, certain molecules exist in mirror-image forms (see optical activity). Double bonds are rigid, leading to the possibility of geometric isomers (see isomerism). Some types of bonds, such as the amide linkages that join the amino acids in peptides and proteins (peptide bonds), are apparently single but have some double-bond characteristics because of the electronic structure of the participating atoms. The configurations of enzymes and their substrates, determined by their covalent bonds (particularly the peptide bonds) and hydrogen bonds, are crucial to the reactions they participate in, which are fundamental to all life. http://www.answers.com/topic/covalent-bond?cat=health

Is chlorophyll an ionic or a covalent bond?

Chlorophyll makes a covalent bond, as the elements it is made from, hydrogen, chlorine and carbon, all need what the others have and so they form a covalent bond

What type of bond is hydrogen to hydrogen?

Non-polar, single and covalent BondA bond between two non-metals is generally going to be a covalent bond due to the affinity to electrons and the need to "pick them up." Molecular hydrogen is a good example and the hydrogens are indeed bonded by a covalent bond, sharing electrons to complete a full valence shell. In the category of covalent bonds, there are polar and non-polar covalent bonds. In some covalent bonds, electrons are shared unequally, resulting in the partial charge of one atom and the opposite charge of the other atom(s). This occurs when one atom in the compound has a higher electronegativity, or affinity to electrons.But because both atoms in the molecule H2 have the same electronegativity (as atoms of the same element), electrons are shared more or less equally, resulting in a non-polar covalent bond.