Question

1. which elements are most common in the human body?
2. where are electrons, protons and neutrons located in an atom? (draw a picture to help)

Explanation:

Question 2

The human body is mainly composed of elements like oxygen, carbon, hydrogen, and nitrogen. Oxygen is abundant due to water and organic molecules. Carbon forms the backbone of organic compounds. Hydrogen is in water and organic structures. Nitrogen is in proteins and nucleic acids.

In an atom, protons and neutrons are located in the central nucleus. The nucleus is a dense, positively - charged region. Electrons are located in electron clouds (or orbitals) surrounding the nucleus. These electron clouds are regions of space where electrons are likely to be found, and they are arranged in different energy levels (shells) around the nucleus. A simple diagram would show a small, dense nucleus at the center with protons (positive charge) and neutrons (neutral charge) inside it, and electrons (negative charge) moving in orbits or cloud - like regions around the nucleus.

Answer:

The most common elements in the human body are oxygen ($\text{O}$), carbon ($\text{C}$), hydrogen ($\text{H}$), and nitrogen ($\text{N}$) (in order of decreasing abundance, with oxygen being the most abundant, followed by carbon, hydrogen, and nitrogen).

Question 3