A crystalline solid is brittle, has a high melting point, and has low electrical conductivity is ionic bonds between metals and nonmetals.
On the basis of structure, ca F2 is the most brittle
hope this helps
Scientist rely on their estimates when they cannot obtain on exact numbers
Where are the selections ????
Use your senses, so sound, smell( pls waft), change in color or tempurature, bubbles, or light
