Valence electrons are present in more than one energy level or shell around an atom's nucleus. They are the electrons involved in chemical bonding and determining the reactivity of an element.
The element in question is magnesium. It has 12 protons (more than sodium and less than argon), 2 more valence electrons than oxygen (which has 6), and 8 fewer valence electrons than neon (which has a full valence shell with 8 electrons).
Aluminium has three valence electrons and phosphorous has five, hence the latter has more.
All halogen elements have 7 valence electrons (group 17): F, Cl, Br, I, At.
Neon has more valence electrons than oxygen. Neon has a full outer shell with 8 valence electrons, while oxygen typically has 6 valence electrons.
Calcium has more valence electrons than potassium. Potassium has only 1 valence electron, while calcium has 2 valence electrons.
Neon has 0 valence electrons so it is not possible to have an element with fewer valence electrons. There can, therefore, be no such element.
The element in question is magnesium. It has 12 protons (more than sodium and less than argon), 2 more valence electrons than oxygen (which has 6), and 8 fewer valence electrons than neon (which has a full valence shell with 8 electrons).
Aluminium has three valence electrons and phosphorous has five, hence the latter has more.
All halogen elements have 7 valence electrons (group 17): F, Cl, Br, I, At.
Neon has more valence electrons than oxygen. Neon has a full outer shell with 8 valence electrons, while oxygen typically has 6 valence electrons.
Neon has 0 valence electrons so it is not possible to have an element with fewer valence electrons. There can, therefore, be no such element.
Calcium has more valence electrons than potassium. Potassium has only 1 valence electron, while calcium has 2 valence electrons.
The element described has more valence electrons than oxygen but fewer than neon, more protons than sodium but fewer than argon. This element is magnesium, which has 12 protons, 12 valence electrons (2 more than oxygen but 2 less than neon), and is situated between sodium and argon on the periodic table.
The atom with seven valence electrons and two more protons than phosphorus is chlorine (Cl). Chlorine has 17 protons and 7 valence electrons, while phosphorus has 15 protons and 5 valence electrons.
there is no such element
Cl Chlorine
The element described would be phosphorus. Phosphorus has 5 valence electrons (more than oxygen) and 15 protons (more than sodium but fewer than argon).