The atomic mass element 28.08 is located in the 3rd period. determine in which group and subgroup it is located.

Chemical element – silicon (Si)

Is in the third period (small), in the fourth group (main subgroup)

Serial number – 14

The relative atomic mass is 28

Atom structure:

The number of electrons is 14, the number of protons is 14, in order to calculate the number of neutrons, it is necessary to subtract the ordinal number from the relative atomic mass, we get: 28 – 14 = 14

+ 14Si) 2) 8) 4 1s2 2s2 2p6 3s2 3p2

At the last energy level there is 2 electron, the level is not complete.

The highest valency is IV

Higher oxide formula: SiO2, acidic nature of the oxide.

Acid formula: H2SiO3

Volatile hydrogen compound: SiH4