Need with this next to each formula, write the number of atoms of each element found in one unit of the compound.
these are the compounds below:
1. potassium iodide, ki
2. sodium sulfide, na2s
3. silicon dioxide, sio2
4. carbonic acid, h2co3

The number of atoms present in one unit of the following compounds is:

a). Potassium Iodide , KI = 2

b).Sodium Sulfide, = 3

c). Silicon Dioxide , = 3

d). Carbonic Acid , = 6

Explanation:

Atomicity : It is defined as the number of atoms that are present in a given molecule/compound.

Atom : The smallest unit of matter is called atom. For e.g O is atom of oxygen but is not an atom , it is molecule of oxygen .

molecule has 2 atoms of Oxygen

Similarly  Na , K , Fe are atoms but , ,,  are molecules

a).Potassium Iodide

KI = 1 atom of K + 1 atom of I

Total atoms = 2

b) Sodium Sulfide

= 2 atoms of Na + 1 atom of S

Total atoms = 3

c) Silicon Dioxide

= 1 atom of Si + 2 atoms of O

Total atoms = 3

d) Carbonic Acid

= 2 atom of H + 1 atom of C + 3 atom of O

= 2+1+3

Total atoms = 6