Which is most likely to form a negative ion?

A. An element from group 17

B. A metal

C. An element from group 1

D. An element with atoms that have eight valence electrons

A

Explanation:

In other options, they form positive ion as they have extra electrons in their valence shell

But in group 17, all the elements have 7 electrons in their valence shell,inorder to attain octet they require one more electron

Hence,they form negative ion by gaining electron

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

the answer would be c