total number of protons irian atom
mass number of an atom
total number of neutrons in an atom
total number of electrons in the. outer Most shell of an atom
Covalent bonds are directional
Ionic bonds are directional
Both covalent and ionic bonds are directional
Both covalent and ionic bonds are non-directional
Water
Alcohol
Mercury
Phenol
Only 2
Only 3
2 and 3
1, 2 and 3
van der Waals forces
covalent bonds
interionic attraction
hydrogen bonding
`4`
`6`
`8`
`10`
electrovalent bond
covalent bond
hydrogen bond
van der Waals' bond
electrovalent bond
covalent bond
hydrogen bond
van der Waals' bond
2+
4+
6+
8+
Silicon, germanium and tin
Germanium and tin
Germanium, tin and lead
Tin and lead
low melting point and low boiling point
low melting point and high boiling point
high melting point and low boiling point
high melting point and high boiling point
Chlorides of Fe and Mn
Nitrates of Ag and Pb
Carbonates of Pb and Cu
Phosphates of Na and `NH_4`
`XY`
`X_2Y`
`XY_2`
`X_2Y_3`
`A _5B_ 3` and `A _2 B_5`,
`A_ 3 B_ 2` and `A_ 5 B_ 2`
`A _2 B_ 3` and `A _2 B_ 5`
`A _2 B_ 3` and `A_ 3 B_ 5`
`CO_2`
`H_2S`
`NH_3`
`BF_3`