How do you find valence electrons in electron configuration?

Some familiar products contain some of the same types of atoms. for instance, the chemical formula for baking soda is nahco 3. the chemical formula for liquid bleach is naclo, and the chemical formula for table salt is nacl. which choice best describes why these three products have some of the same types of atoms in common?

If maltose undergoes hydrolysis what subunits does it results to?

What is calcium oxide+diphosphorus pentoxide--> calcium phosphate balanced