Which of the following substances is an element?(1 point) Responses protein protein insulin insulin salt salt hydrogen hydrogen
hydrogen
The element among the substances provided is hydrogen.
To determine which of the substances listed is an element, we need to understand what an element is. An element is a substance that cannot be broken down into simpler substances through chemical reactions. It consists of only one type of atom.
Now, let's analyze the substances provided:
1. Protein: Proteins are complex molecules made up of a combination of different elements such as carbon, hydrogen, oxygen, and nitrogen. Therefore, protein is not an element.
2. Insulin: Insulin is a hormone composed of a chain of amino acids. Similarly to proteins, it contains carbon, hydrogen, oxygen, and nitrogen atoms combined together. So, insulin is not an element.
3. Salt: Salt, also known as sodium chloride (NaCl), is a compound made up of two elements, sodium (Na) and chlorine (Cl), bonded together. While sodium and chlorine are elements themselves, salt is not considered an element.
4. Hydrogen: Hydrogen (H) is indeed an element. It is the lightest and simplest element, consisting of only one proton and one electron.
Therefore, the substance that is an element among the listed options is hydrogen.