They do not, H2O is water an there is only one Hydrogen. H2O2, this one have 2 hydrogen, because there is a two in front of the oxygen.
Answer:
They form crystals,They're good insulators
Explanation:
Answer:
All the elements of a group have similar chemical properties because they have same no. of valence electrons in their outermost shell.
All the elements of a period have different chemical properties because they have different no. of valence electrons in their atoms.
Solid, Liquid, Gas, and Plasma
