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Answers
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1. Electron affinity will be zero for alkali metals and noble gases. The element present in the options that is present in the periodic table is Ar (Argon)
2. Bromide ion, since the increase in negative character will increase the atomic size
3. The answer is lithium, since they both attain noble gas configuration of helium when they involve in bonding. You cannot say Aluminum, since it can form four bonds forming an octet, although its valency is 3
4. NaF is ionic
5. The answer is sodium (you will learn in a chapter called co- ordination chemistry, when there are unpaired electrons, the ions will form a colour. And sodium has no unpaired electron).
Fill ups
1. partially, hydroxyl
2. ionic, polar
3. period, less
4. divalent ion, monoatomic dication (a single atom forms a +2 charge)
5. strong alkali, weak alkali