There are 18 neutrons. If the valence level has 7 electrons, that means the first is full, and always has 2(unless its hydrogen which has 1) and the second will be filled with 8 making 17 total. Since the electrons always equal protons we know there are 17 protons. Since Atomic Mass is protons plus neutrons, and atomic mass is 35 we minus 17 form 35 and have 18.
No, valence electrons do not determine the atomic mass of an element. Atomic mass is primarily determined by the number of protons and neutrons in the nucleus of an atom, while valence electrons are the electrons in the outermost energy level of an atom that are involved in chemical bonding.
outer energy level electrons... called valence electrons
This element is caesium (Cs), with the atomic number 56.
Valence electrons are the electrons in the outermost energy level.
The first energy level has a maximum of two valence electrons. The second and third energy levels have a maximum of 8 valence electrons.
neutrons
Atomic number 10 corresponds to neon. Neon has 10 electrons, with 2 electrons in the innermost energy level and 8 electrons in the outermost energy level.
outer energy level electrons... called valence electrons
An ATOM. The sub-atomic particles are Protons, Neutrons. and Electrons. The protons and neutrons are collectively named 'nucleons, because they form the nucleus of an atom. The electrons are in energy shells around the nucleus.
The energy of the valence electrons is greater than the energy of the core electrons.
The energy of the valence electrons is greater than the energy of the core electrons.
The energy of the valence electrons is greater then the energy of the core electrons.APEX
A neutral atom with an atomic number of 15 (phosphorus) will have 5 electrons in its outermost energy level. This is because the atomic number tells us the number of protons, which is equal to the number of electrons in a neutral atom. The outermost energy level for phosphorus is the third energy level.
The energy is higher.
The valence electrons
Valence electrons are the electrons in the outermost energy level.
This element is caesium (Cs), with the atomic number 56.