||1:ONE of the first inklings that chemistry has an underlying pattern was the discovery, early in the 19th century, of lithium, sodium and potassium-known collectively as the alkali metals.||2:Though different from each other they have strangely similar properties.||3:This was one of the observations that led a German chemist called Johann Debereiner to wonder if all chemical elements came in families.
词性:|noun|
‘the records give us an _inkling_ of how people saw the world’
