3 answers
To fulfill the octet rule, the first energy level (also known as the first shell) can hold a maximum of 2 electrons. The second energy level can hold a maximum of 8 electrons.
Therefore, the first energy level holds 2 electrons, and the second energy level holds 8 electrons.
The basic unit of a chemical element is an atom. An atom is the smallest unit of an element that retains the properties of that element. Atoms consist of a nucleus, which contains protons and neutrons, surrounded by electrons that orbit around the nucleus. Each element is defined by the number of protons in its nucleus, known as the atomic number.
