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Atomic radius increases down a group in the periodic table. This can be explained by a phenomenon called electron shielding. As the number of electron shells is increased down the group, the attraction be...

PH3 is not hydrogen bonded whereas NH3 is hydrogen bonded. Hydrogen bonding is the strongest type of covalent bonding.

The atomic radius of the elements decreases from sodium to argon. This is because the number of protons increases (sodium has 11, argon has 18) so the nuclear charge increases. Therefore, the attraction b...

1s2,2s2,2p6,3s2,3p6

For a given reaction, it is often seen that the rate of reaction doubles following a 10oC increase in temperature. But why is this?

(note: Here I would plot a graph of Rate vs Temperature, to show ...