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Helium was discovered by
Helium was discovered by Sir Joseph Norman Lockyer and Pierre Janssen (often associated with the name Frankland & Lockyer). In 1868, they observed a yellow spectral line in the sunlight during a solar eclipse. This spectral line did not match any known element on Earth, leading to the discovery of helium.
$ XeF_4 \& XeF_6$ are expected to be
all the xenon fluorides are strongly oxidizing
Noble gas forms max. No. of compounds is
$ XeF_2, XeOF_2, XeF_4, XeOF_4, XeF_6, XeO_3 $
Nuclear Fusion Produces
$ 1^{H^{2 }}+ 1^ {H ^ {2}} \rightarrow 2 ^ { He ^ {4 } } $
Among fluorides, one that does not exists is
$ HeF_4$ does not exists
Last orbit of argon would have _______e-
$ Ar_{18} \rightarrow 2, 8, 8 $
Electronic configuration of neon is
$ Ne_{10} \rightarrow 1S^2, 2S^2 2P^6 $
Which of following noble gas s is least polarizable
He is least polarizable bec. Of small size.
$ XeF_6 $ on hydrolysis gives
$ XeF_6 + 3H_2O \rightarrow XeO_3 + 6HF. $
A high molecular weight molecule which does not contain repeating structural units is called a
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.