How does a network solid differ from ionic compounds?

Network solids are non conducting unlike ionic compounds.

Explanation:

Ionic compounds are formed by complete transfer of electron from the cation to anion. So it is mostly directional bond than the covalent bond. As the network solids are a kind of covalent bonds, they are formed by mutual sharing of electrons.

So they are non conducting and hard in nature. The difference between covalent and ionic compounds are that the covalent compounds are non-directional and non conducting in nature compared to ionic compounds.

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.