What is hard and symmetrical in shape, forms from a solution

Crystals.

Explanation:

A crystal is a solid element composed of atoms arranged in such a way as to ensure that a three-dimensional structure is organized and visualized.

In nature the crystal comes in many forms, starting with samples that we find in our daily homes, such as the grain of salt or sugar. Another example is snowflake, which is composed of frozen particles of crystalline water.

Most minerals are crystals, and these can vary greatly in their possibilities of use and their value. Quartz, rhodonite and gold are precious and highly valued because, due to their natural form, they are used in the composition of various types of jewelry.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

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