Which of these atoms will most easily form a negative ion-sodium, aluminium, chlorine or helium?

Answer 1

Chlorine. Helium's inert; Na's a positive ion; AL can go either way.

Answer 2

Chlorine.. because it is in the next-to last period of the periodic table, meaning that it's outer electron shell is just one electron shy of being inert, so it will attract an ion that has an outer shell of one extra electron quite nicely.

Helium is in the final period meaning that it is already inert, so it will not attract any other ions, but will repulse them all, except under exceptionally high amounts of energy, such as under the surface of the sun.

Aluminum, belonging to the middle of the periodic table means that it is much more likely to be an electron donor, and therefore a cation, or positive ion, but, in the presence of lower first period atoms, like cesium, and in the absence of other more readily oxidized anions like chlorine, aluminum will behave like an anion. But such systems are rare and require a lot of energy.

So, the answer is Chlorine.

Answer 3

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Answer 4

Sodium and aluminum are metals,so they cannot form negative ion.and Helium is a noble gas this group of atoms are unreactive because their valency electron is 8.Chlorine is a non metal and the only one which can form negative ion. If you can't identify b/n metals,non-metals and noble gases first you should draw the electronic configuration and if the outermost electron is 1,2,3 it's metal which forms positive ion.5,6,7 it's non-metal which forms negative ion.if 8 noble gas it is unreactive.

Answer 5

i think that is sodium

Answer 6

chlorine...