Which molecule contains the fewest number of atoms? (2 points)
2 answers:
Answer: The correct option is, (a)
Explanation:
(a)
In this molecule, there are one number of samarium atom and three number of chlorine atoms. Hence, the total number of atoms present in are, four.
(b)
In this molecule, there are one number of rubidium atom, one number of nitrogen atom and three number of oxygen atoms. Hence, the total number of atoms present in are, five.
(c)
In this molecule, there are one number of selenium atom, two number of hydrogen atoms and three number of oxygen atoms. Hence, the total number of atoms present in are, six.
(d)
In this molecule, there are one number of silicon atom and four number of hydrogen atoms. Hence, the total number of atoms present in are, five.
From the above we conclude that, molecule contains the fewest number of atoms that is four than the other molecules.
Hence, the correct option is, (a)
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Answer:
Two Half-lives
Explanation:
Let number of Parent nuclei Initially present be X,
Then, finally Parent nuclei Will remain with
daughter nuclei.
In one half- life , parent nuclei becomes half of initial.
So, starting with X parent nuclei,
After one half-life, it will degrade to .
After another half life , Parent nuclei will become half of
Which is equal to .
So, Parent nuclei have to go through Two half-lives.