Answer:
E. The atoms in amorphous silica do not pack as efficiently in three dimensions as compared to the atoms in quartz.
Explanation:
Quartz is a crystalline structure with a lattice which is very compact and produces flat faces that align with one another causing high density.
Silica has covalent bonding and forms a network structure. Silica, SiO2 is an amorphous solid and does not posses the same lattice or crystalline structure as Quartz, making it less dense.
The answer is a Nucleus. Eukaryotic cells have nuclei while;e prokaryotic cells do not.
chemical properties and same number of shell
Explanation:
elements in the same group have the same number of eletrons in their outermost shell and hence have the same chemical properties
Answer:
Carbon 12 and 13 are carbon isotopes, meaning that they have additional neutrons:
Carbon 12 has exactly 6 protons and 6 neutrons ( hence the 12 )
Carbon 13 has 6 protons and 7 neutrons ( hence the 13 )
They differ in the number of neutrons in the nucleus.
Names:
carbon-13, C-13
carbon-12, C-12
Answer:
1:C as all metal are good conductors of heat & electricity
2:D conductivity as it needs delocalized electrons normaly
3:B good conductors of heat & electricity
