Question

Name the group of atoms that can react like an atom but cannot exist independently

Answer 1

Here is the answer ----
Some exits like noble gases like HELIUM who have valency 0.

While atom who don't have 8 electrons in there other most orbit will tries to make 8or 2 elections in there outermost orbit by giving and taking electron i.e by making molecules or compounds eg take lithium which have 3 electron hence its valency is 1 so in order to make 2 or 8 in its outermost orbit it have accept 7 or lose 1 electron but 1 electron is easier…

Atoms which loses forms positive ion while which accept will form negative.

Now eg take oxygen which have - 2 valency so it want 2 electron. Now if there are 2 lithium each give 1–1 electron. So oxygen will accept both electron and both 2 lithium and 1 becomes ion, one positive and one negative respectively. As we know opposite charges attract each other. Hence bond is form.

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