How many bonding electrons are present in the Lewis structure for the bicarbonate ion,shown below? 
Definitions:
Small Intestine
A part of the gastrointestinal tract between the stomach and large intestine, where most of the digestion and absorption of nutrients occurs.
Lactase
An enzyme in the small intestine that enables humans to assimilate lactose (milk sugar).
Melanin
A pigment found in most organisms, responsible for coloration of the skin, hair, and eyes, and protection against UV radiation.
Vitamin D
A fat-soluble vitamin essential for healthy bones and immune function, obtained from sunlight exposure, food, and supplements.
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