It creates its dipositive ion.
2
2 electrons orbit in the outer shell. If its a neutral atom, then it will have the same number of electrons as protons. Magnesium has 12 protons and 12 electrons.
What is the valance number electrons for Group IIA elements?When you look at the periodic table, you see 8 major columns. This represents the s and p orbitals, which hold 2 and 6 electrons respectively. The elements are placed in a column, based on the number of electrons in the s and p orbital of the outer shell. For example, Mg is in column 2 because it has 2 electrons in the s orbital of the 3rd shell. All elements in column 2 have 2 electrons in the s orbital of their outer shell. The valance number is the charge on an ion of an element. Elements in column 2 do not have a strong attraction for the 2 electrons in their outer shell. An element such as O in column 6 has a stronger attraction for electrons than Magnesium. When an atom of Mg is close enough to atom of O, and a little heat is supplied, the 2 electrons in the outer shell of Mg will move to the outer shell of the O atom giving the O atom 8 electrons in its outer shell, making it very stable.After the 2 electrons in the outer shell of the Mg atom have moved to the outer shell of the O atom, the Mg ion has 2 less electrons in its shells than protons in the nucleus atom. Since protons have a +1 charge and electrons have a -1 charge, the Mg ion has a net charge of +2. The O atom now has 2 more electrons in its outer shell and has a net charge of -2. The charge is the valance number. All atoms of elements in GroupIIa have 2 electrons in the in their outer shell so their valence number is +2.Do a google search for, "magnesium burning", and go to images, and you will see what happens. If you are in a chemistry class, ask your instructor to do this lab.
Mg or Magnesium has 2 electrons in its Valence shell. If you have the right Periodic Table it should have numbers 1A, 2A,... 3B, ect listed above each column. These numbers represent the number of Electrons in the valence shell of all the elements in that Column.
Magnesium is in Group 2 of the Periodic Table, so it has two outermost electrons. To have a full complement of e- in its outer shell, it must lose 2, hence, it becomes an Mg2+ ion.
The chemical symbol for a magnesium atom that has lost two electrons is Mg2+.
Two electrons.
Two, like every other atom in periodic table column 2 (extended form).
Helium (He) has 2 electrons in its outer shell. Calcium (Ca) has 2 electrons in its inner shell and 8 electrons in its outer shell.
To make the atom equal you get another atom that has the amount you need to make 8 on the Bohr model, for instance Mg (Magnesium) and O (oxygen) Mg has two electrons on the outer shell/ring and oxygen has 6 electrons, to make it equal you would either add two Mg to O or you could add six O to Mg, then it would be written like Mg ^2+ + O^2- --> MgO
Boron has 3 electrons in the outer shell and 2 electrons in the inner.
The atomic number of Mg (and not written as mg) is 12. So there are 12 protons and 12 electrons Note: Mg is the symbol for the element magnesium mg generally stands for milli grams