Type of bonding when if forms compounds (ionic, covalent, or both) give examples. this is hard, please help!!?

Question

This is for the element helium.

Answer 1

Covalent: when atoms are near each other on the periodic table. More a sharing of electrons between the nucleii.

N2, O2, F2, Cl2- perfect covalent bonds.

NO- very much covalent bonds

Ionic: when atoms are far from each other on the periodic table. More a transfer of an electron from one atom to another. Then electrostatic forces hold them together.
Most pronounced when you have bottom left combining w/ top right.

CsF- very ionic
BaF2

Both- when you have different atoms in the same molecule, so both effects can occur.

NaCN- The Na-C bond is ionic, the CN bond is covalent.

Answer 2

Ionic bonds ocurrs when electrostatic forces are the ones responsibles for the union of atoms. Examples:

NaCl -ionic bond
AgNO3 - ionic bond
CH3COO Na - ionic bond (in this last particular compound we have both types of bonds: within the acetate ion the bonds are covalent but between acetate and sodium the bond is ionic)

Covalent bonds ocurrs when the outer electrons (valence electrons) are shared by two or more atoms. Examples:

H2O - Covalent bond
CH4 - covalent bond
H2SO4 - covalent bonds

When some covalent compounds are dissolved in polar solvents (as water is) they "ionize" it and then dissociate it in ions that can produce ionic compounds.

Example: HCl + H2O ------> H3O+ + Cl- (HCl is covalent and was ionized in water to Cl- and H+ ions)

2 Cl- + MgSO4 ------> MgCl2 + SO4= (the ion Cl- that could come from last reaction can form an ionic salt of MgCl2)


Good luck!

Answer 3

Covalent bonds- bonds formed when atoms that combine have the same electronegativities, thus, they're just virtually sharing their valence electrons and what causes this bond is the attraction the binding atom's valence electrons have to the positive nucleus. Ex. the diatoms, O2 etc

Ionic bonds- bonds formed when there's a complete transfer of valence electron from one atom to the other, this is because they have a great difference in their electronegativities. Ex. NaCl, KI etc

Answer 4

Ionic bonds form between ions when an ion with an extra electron donates that electron or electrons to the ion that needs the extra electrons to complete the outer shell.:

Cu2SO4 here both Cu's accept one electron from the donated electrons of the SO4 the molecule
NiSO4 here, Ni accepts both electrons from the SO4 molecule

Covalent bonds are formed when electrons are shared between elements:

CCL4 here, C has 4 valence electrons and shares one with each Cl atom

Answer 5

Helium forms no known compounds. It can be ionised however