1. a single chemical compound or element that is found in nature amorphous 2. the amount of kinetic energy that a material can absorb without breaking cleavage 3. a break that does not follow a flat surface, but rather is rough and uneven crystal 4. resistance to being scratched fracture 5. a solid form resulting from the arrangement of atoms, ions, or molecules in definite geometric patterns hardness 6. a clean break parallel to planes of weakness in a crystal mineral 7. a non-crystalline solid having no orderly arrangement of molecules toughness

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of c is as shown here in the image.

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

24

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.