Which of the following substances is an element? (1 point)
insulin
O protein
O hydrogen
O salt
hydrogen
Hydrogen is an element.
To determine which of the substances is an element, we need to understand what an element is. An element is a substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.
Let's analyze each substance given:
1. Insulin: Insulin is not an element. It is a protein hormone produced in the pancreas that helps regulate blood sugar levels.
2. Protein: Protein is not an element either. It is a complex biological molecule composed of amino acids.
3. Hydrogen: Hydrogen is an element. It is the lightest element on the periodic table and commonly exists as a diatomic molecule (Hâ‚‚).
4. Salt: Salt is not an element. It is a compound composed of sodium (Na) and chlorine (Cl), which are both elements.
Therefore, the substance that is an element is hydrogen.