Elements in Baking Soda:
Baking soda, also known as sodium bicarbonate, is a chemical compound composed of three elements: sodium, hydrogen, and carbon. The chemical formula for baking soda is NaHCO3.

Classification of Elements:
To classify the elements present in baking soda as metals or non-metals, we need to analyze the properties of each element.

Sodium (Na):
Sodium is a metallic element. It belongs to the alkali metal group and is highly reactive. It has a silvery-white appearance and is soft enough to be cut with a knife. Sodium is a good conductor of electricity and heat. In baking soda, sodium is present as the cation Na+.

Hydrogen (H):
Hydrogen is a non-metallic element. It is the lightest and most abundant element in the universe. Hydrogen is a colorless, odorless, and highly flammable gas. It does not conduct electricity. In baking soda, hydrogen is present as the anion HCO3-.

Carbon (C):
Carbon is a non-metallic element. It is known as the building block of life as it forms the basis of organic compounds. Carbon has a wide range of allotropes, including diamond and graphite. It is a poor conductor of electricity. In baking soda, carbon is present as part of the bicarbonate anion (HCO3-).

Summary:
In baking soda (sodium bicarbonate), the elements present are sodium (Na), hydrogen (H), and carbon (C). Sodium is a metal, while hydrogen and carbon are non-metals. Therefore, baking soda contains both metals and non-metals.