Respuesta :

chloepenney
Answer:

Phosphorus, chlorine and selenium.

Explanation:

If you look at a periodic table, you will notice that phosphorus, chlorine and selenium are all in groups 15-17. Elements in these groups are more likely to gain electrons then they are to lose them, thus making them more likely to form an anion.
This is because they want to fill their outer valence shell of electrons so that they can have a full octet and for groups 15-17 it’s easier to gain 1-3 electrons then it is to loose 5-7 electrons.

Phosphorus, chlorine and selenium are likely to form an anion.

Anions are the ions of the atoms that have a negative charge and are formed as they gain electrons from the atoms of other species called the cations.

Which elements will form anions?

The elements Phosphorus, chlorine and selenium all belong to the group 15,16 and 17 of the periodic table and are more likely to gain an electron from the atoms of other elements as compared to loss electrons.

They gain electrons as they have not fully or half-filled valence shells, so to complete the octet the elements gains electrons and forms anions. Magnesium on another hand has two extra electrons in its octet and they are more likely to donate electrons and form cations.

Therefore, options 1,2 and 4 are the correct elements.

Learn more about the anions here:

https://brainly.com/question/19401818

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