they gain electrons because they need an electron to fill there outer most shell to make it stable !!!
Nonmetals have high electronegativity (Ability to attract electrons) so they attract more electrons then lower electronegativity elements.
Why is a question asked in philosophy, not in science, but I'm assuming that by why you mean how.
Electronegativity is what determines whether an element tends to gain or lose electrons. The more electronegative, the greater the tendency to gain rather than lose electrons, and vice versa. Electronegativity is determined by the number of electrons in the inner shells (more inner-shell electrons means more repulsive force to offset electronegativity), and the number and arrangement of the electrons in the outer shells (orbitals that are almost full tend to "want" to gain another electron). This is why elements are more electronegative on the right side of the Periodic Table (where the outer shells are almost full) and are less electronegative near the bottom of the periodic table (where the atoms have larger numbers of inner-shell electrons).
The very definition of a metal is an element whose atoms' electronegativities are weak enough so that the electrons are, rather than tightly bound into their proper orbitals, freely buzzing throughout the entire metal as a sort of fluid. Logically, an element that exhibits the opposite properties, that holds on tight to its electrons due to its high electronegativity, would be a nonmetal.
An atom whose electrons are loose tends to lose them; conversely, an atom with a tight hold on its electrons tends to grab onto more, if it has any room in its orbitals. This is why metals tend to form electron-stripped, positively-charged cations, while nonmetals such as halogens and oxygen (but not noble gases, whose orbitals are completely occupied) tend to load up on electrons to form negatively-charged anions.
Atoms want to be as stable as possible. This means they want to be as close to the noble gasses as they can. By gaining electrons, they fill up the p level to have as many electrons as the nearest noble gas.
Their atoms have 5,6,or 7electrons in the outside shell and would be more stable with 8 electrons in the outside shell
The valence shells of non-metals are closer to being full compared to metals, so it requires less energy to gain electrons than to lose electrons.
They are close to completing their valence shell, and thus becoming stable.
Most metals and non-metals bond together to get eight electrons in their outer occupied shell. This is what is referred to as ionic bonding.
NO. Nonmetals tend to GAIN electrons to complete their outer shell. By gaining electrons, they become a negatively charged species, which is what an anion is. Metals tend to LOSE electrons to end up with a full outer shell; in losing electrons, they develop a positive charge (become cations).
Nitrogen has five electrons in its outer shell and bromine has seven in its outer shell.
Metals have between 1 and 3 valence electrons; nonmetals have between 4 and 8. Normally, after engaging in a chemical reaction the nonmetals will wind up with a full outer shell of 8 electrons.
8 electrons on the outer shell
There is no set amount of valence electrons for nonmetals. The amount of valence electrons a nonmetal has is determined by the number of electrons on the outer shell of the atom.
Nonmetals are closer to a full outer shell. They would rather gain electrons to complete the shell. They are unlikely to lose electrons.
Most metals and non-metals bond together to get eight electrons in their outer occupied shell. This is what is referred to as ionic bonding.
Because the outer shells are very close to the nucleus and the number of electrons in the outer shells are between 4-8. Therefore, they are not freed from the nucleus easily rather they look for some more electrons to fill its outer shell which is technically called as covalent bond.
NO. Nonmetals tend to GAIN electrons to complete their outer shell. By gaining electrons, they become a negatively charged species, which is what an anion is. Metals tend to LOSE electrons to end up with a full outer shell; in losing electrons, they develop a positive charge (become cations).
Metals. Nonmetals are closer to filling up their outer electron shell so the metals give up their electrons and become positive ions.
The outermost shell of any noble gas is completely filled. And because of this, we can say that they have 8 electrons in their outer shells, with the exception of helium, which has 2 electrons in its outer shell.
No. Argon has eight electrons in its outer shell and magnesium has two electrons in its outer shell.
Nitrogen has five electrons in its outer shell and bromine has seven in its outer shell.
Calcium has two electrons in the outer shell.
Bromine has 7 electrons in its outer shell.
Vanadium has on the outer shell two electrons.