Keyword Analysis & Research: why was it difficult to discover noble gases

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
why was it difficult to discover noble gases	0.54	1	5346	43	44
why	0.25	1	863	48	3
was	0.29	0.2	4517	86	3
it	0.57	0.4	953	97	2
difficult	0.85	1	5077	93	9
to	0.46	0.8	3046	26	2
discover	0.42	0.5	9965	49	8
noble	0.73	0.2	666	41	5
gases	0.64	1	9347	94	5

Keyword	CPC	PCC	Volume	Score
why was it difficult to discover noble gases	0.83	1	5702	15