How do non metals form negative ions?

Answer 1

They gain the few electrons they need to form full octets

Answer 2

I think this question should be categorized rather into the Chemistry section. Well according to the Periodic Table, the elements from groups 5-7 are classified as non-metals. This is because these elements dont conduct electricity in any states with the exception of carbons allotrophe- Graphite. These elements have 5-7 electrons depending on which group they are in, in their outer (valence) shell and these electrons determine the chemical properties of the element in terms of the elements behaviour during chemical reactions. Elements usually need to have 8 electrons in their outershell so as to attain a noble gas structure during the chemical reaction. Therefore they have to gain 3-1 electron(s) depending on the group they are in, during the reaction and they usually get these electrons from the other component that they are reacting with hence by gaining these electrons the ions acquire a negative polarity (charge).

Answer 3

Non-metals for negative ions because they have the ability to gain electrons.

Only non-metals form negative ions - this ability (to gain electrons) is intrinsic to the nature of non-metals.

Only metals form positive ions - this ability (to lose electrons) is intrinsic to the nature of metals.

A positive ion (cation) is formed by removing electron(s) from an atom or group of atoms.

A negative ion (anion) is formed by gaining electron(s) an atom or group of atoms.

Answer 4

There are two reasons for that.

Non metals do not have octet of electrons on their valence shell. Addition of electrons help them satisfy octet tule.

Non metals have high electron affinity and hence high tendency to gain electrons.

Answer 5

They are far closer to having a complete octet than metals are, and thus it is easier for them to accept a few electrons, rather than to give up several.