Who said electrons occupy energy levels or shells?
Niels Bohr was the one who stated that first.
The electrons in an atom are located in what is called the electron cloud. The electron cloud is an "area of probability" where electrons may be. The electrons actually occupy fixed energy levels, the so-called Fermi energy levels, around the nucleus of the atom, and we identify these energy levels as shells and orbitals. Links to relevant posts can be found below.
In a practical, simplified sense it is the orbital "shell" that an electron can occupy (quantum theory contends that electrons cannot occupy just any old space around a nucleus, but is restricted to specific "levels", "volumes" or "shells"). More general information is in the article in the link below.
Bohr model is simplified model of an atom structure, it contains: number of shells (energy levels) around the nucleus electron number in each shell number of protons and electrons in nucleus Sulphur atom consists of: Electrons in shells (energy levels): 2 electrons 8 electrons 6 electrons Its symbol is S, nucleus contains 16 protons and 16 neutrons
Eight. The electrons with the highest energy levels are counted as the valence, or outer, orbitals. There are shells that contain more electrons such as D or F shells that can accommodate for 10 and 14 electrons respectively, however they are a lower energy level than their respective S and P shells that fill up before them which hold 2 and 6 electrons equaling a max of 8 outer orbitals.
they contain electrons, which are negatively charged and revolve at high speed around the nucleus of an atom. the first shell (the one nearest to the nucleus) can hold a maximum of 2 electrons. the second shell can hold a maximun of 8 electrons. If there any remaining electrons they will go on the third shell. the third shell can hold a maximum of 18 electrons. the shells closest to the nucleus (inner shells) must…
Atoms combine with other atoms by forming links called bonds. Chemical bonds result from interactions of electrons. The electrons of an atom occupy one or more regions of space called electron shells that encircle the nucleus. Because electrons have a leel of energy characteristics of the particluar shell they are in, the shells are sometimes called energy shells. Each elecron shell can hold a limited number of electrons. The maximum number of electrons that each…
The atomic number of calcium is 20 as it has 20 protons and 20 electrons, they are located outside the Nucleus in the orbits known as energy levels, and are commonly known as shells of the atom. in the first energy level there are 2 electrons, in the second energy level there are 8 electron, in the third energy level there are 8 electrons, and in the fourth energy level there are 2 electrons.