Answer:
In order for people to survive, we need water. If we wanted to live on the moon, we would need water.
Answer:
Only one atom are bonded to the central atom in the 
.
Explanation:
Fluorine most electronegative element.
The atomic number of fluorine is 9.
Electronic configuration - 
Hence, it required only one electron to get noble gas[Ne] electronic configuration.
In the molecule two fluorine atoms are bonded by single covalent bond to get stability.
Each atom share one electron and form a bond.
The structure of molecule is as follows.
Answer: Cations (positively-charged ions) and anions (negatively-charged ions) are formed when a metal loses electrons, and a nonmetal gains those electrons. The electrostatic attraction between the positives and negatives brings the particles together and creates an ionic compound, such as sodium chloride.
Antacid is a substance which neutralizes excess acid secreted by the stomach.So by using it ,it will neuralize the excess acidity and prevents heart burns etc.
