Sc i believe is the one u trying to answer.. woop a 2nd chem question.. lucky i take chem haha :P
It is As, Arsenic.
He
This is the Lewis dot notation.
Tellurium element has 52 electrons.It has symbol Te.
The symbol An doesn't exist.
These would be the elements in group 16. The elements in group 16 have six valence electrons. Those valence electrons are represented in a Lewis diagram by surrounding them with six dots. When drawing a diagram for an element with six valence electrons, there should be two pairs of dots (four total), and two separate dots.
The element is helium, with symbol He.
He
Calcium has 2 valence electrons and 4 electron shells. It is represented by the chemical symbol Ca.
The 19th element is potassium, which has the atomic symbol K. It has 19 electrons, including one valence electron that can be easily lost.
This is the Lewis dot notation.
There are 2 valence electrons in Barium.
The electrons in the outermost shell of an atom is known as the valence electrons. These valence electrons determine the reactivity of the atom.
Tellurium element has 52 electrons.It has symbol Te.
A nitrogen atom has 5 valence elctrons. To figure that out you have to count across the row that atom is in and stop at it and the number you counted up to is the number of valence electrons. So... 1st Lithium 2nd is Beryllium 3d is Boron then Carbon then 5th is Nitrogen. Your Welcome)
The symbol An doesn't exist.
Magnesium, an alkaline earth metal, has two valance electrons. The symbol of magnesium is, Mg ----
You can find out the symbol, name, mass, state, protons, neutrons, electrons, electronegativity, valence electrons, charge, and many other characteristics of the element considering the characteristics of other elements in the same group or period.