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Hydrogen is a unique elemnt, it sadd an electron to form the hydride anion in which case it behaves like a halogen. It can lose an electron - get a naked proton, which rapidly attaches to anything in the vicinity, hence formation of acids in aqueous solution when say hydrogen chloride dissolves in water. It also forms single covalent bonds as in hydrogen chloride and methane and many other compounds. So similar to group1, in electron loss but forms covalent bonds group 1 do not in general. Gains an electron like a halogen but these hydrides are reactive and decompose in water.

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What is the difference between hydrogen 16 and hydrogen 17?

1 more neutron


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Group 17 elements need one more electron to achieve the nearest noble gas electronic configuration. Hydrogen also needs one electron. Hence hydrogen behaves like a group 17 element when forming covalent bond.


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Why can hydrogen be placed in either group 1 or 7 on the periodic table?

Hydrogen can be in both group 1 and group 7 due to it's valence shell. Hydrogen only needs 2 (or 0) electrons to be stable. Because it has 1 electron, it can either accept one (like a group 7 element) or give one away (like a group 1 element). It can act like either group.


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