Select correct statement(s).

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Answer 1

The relative abundance in dry air by volume (ppm) of different noble gases is
$H e 5.24 N e 18.18 A r 93.40 K r 1.14 X e 0.09 R n t r a c e s$
Mass decrease (amu) Energy released $(K J m o l^{- 1})$
$_{1}^{2} H +_{1}^{2} H \to_{2}^{4} H e$ 0.026 $2.3 \times 1 0^{9}$
$_{1}^{2} H +_{1}^{3} H +^{4} H e_{2} +^{1} n_{0}$ 0.018 $1.79 \times 1 0^{9}$
$4 H_{1}^{1} \to H e_{2}^{4} + 2 e_{- 1}^{0}$ 0.029 $2.6 \times 1 0^{9}$
Hydrogen is the most abundant element in the known Universe; helium is second.This was earlier rank process which was not followed after this as rank of oxygen is 3 but atomic no. of oxygen is 8.

Although there are nine known isotopes of helium (He) but only helium-3 (3He) and helium-4 (4He) are stable.

Answer 2

The relative abundance in dry air by volume (ppm) of different noble gases is

H e 5.24 N e 18.18 A r 93.40 K r 1.14 X e 0.09 R n t r a c e s

	Mass decrease (amu)	Energy released $(K J m o l^{- 1})$
$_{1}^{2} H +_{1}^{2} H \to_{2}^{4} H e$	0.026	$2.3 \times 1 0^{9}$
$_{1}^{2} H +_{1}^{3} H +^{4} H e_{2} +^{1} n_{0}$	0.018	$1.79 \times 1 0^{9}$
$4 H_{1}^{1} \to H e_{2}^{4} + 2 e_{- 1}^{0}$	0.029	$2.6 \times 1 0^{9}$

Hydrogen is the most abundant element in the known Universe; helium is second.This was earlier rank process which was not followed after this as rank of oxygen is 3 but atomic no. of oxygen is 8.

Although there are nine known isotopes of helium (He) but only helium-3 (3He) and helium-4 (4He) are stable.

Select correct statement(s).

The noble gases are present to the extent of about 1% in the earth's atmosphere, the chief component being argon

Helium is the second most abundant element in the universe after hydrogen

There are two stable isotopes of helium $_{2}^{3} He,_{2}^{4} He$

$_{2}^{4} He$ ise formed by thermonuclear fusion reaction in stars $4_{1}^{1} H ⟶_{2}^{4} He + 2_{1} e^{0}$

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