Explanation:

[tex]Na_2SO_3 = [/tex]

• [tex]Na_2 = 2sodium[/tex]
• S= 1sulphur
• [tex]O_3 = 3 oxygen[/tex]

[tex]K_2CO_3 = [/tex]

• [tex]K_2 = 2Potassium[/tex]
• C= 1carbon
• [tex]O_3 = 3oxygen[/tex]

element name with symbol.

Explanation:

Na = 2sodium

S= 1sulphur

O = 3oxygen

__________

K = Potassium

C= carbon

O = oxygen