The element you are looking for is Scandium, the 4th element in the third group.
Well February 29 is a date that usually occurs every 4 years and this is called a leap year.This day is added to the your calendar in leaps years as a corrective measure because the Earth does not orbit the sun in precisely 365 days! hope it helps and have a great day!
In a pack of CaCl2 and H2O, hydrolysis of Ca+2 will occur
This will result in formation of Ca(OH)2.
The reaction is exothermic in nature
so the balanced thermo-chemical equation will be
CaCl2(aq) + H2O (l) ---> Ca(OH)2 + 2HCl + Heat
In a pack of NH4NO3 and H2O hydrolysis of NH4+ will occur as
NH4NO3 (aq) + H2O(l) + Heat ---> NH4OH(aq) + HNO3 (aq)
It is an endothermic reaction
Covalent network solids typically have high melting points and boiling points.
The chemical formula of a network solid indicates in the molecule by a a formula unit.
Covalent-network solid is a chemical compound (or element) in which the atoms are bonded by covalent bonds in a continuous network extending throughout the material.
For example, SiO₂ is a covalent-network solid.
Silicon Dioxide has a high melting point, around 1700°C.
Silicon(IV) oxide has continuous three-dimensional network of SiO₂ units.
