The structure of the carbon atom

Chemical element carbon (C)
Located in the second period (small), in the fourth group (main subgroup)
Serial number 6
The relative atomic mass is 12
The number of electrons is 6, the number of protons is 6, the number of neutrons is 6
Atom structure:
+ 6C) 2) 4 1s2 2s2 2p2
At the last energy level there are 4 electrons, the level is not complete.
The valence of carbon is variable and can be II or IV
Superior oxide formula CO2, acidic nature of the oxide
Acid formula: H2CO3
Volatile hydrogen compound: CH4