GK
CHEMISTRY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
An atom of H
|
|
|
An atom of He
|
|
|
They are the same
|
|
|
6.02 x 1023
|
Detailed explanation-1: -A helium atom is two times heavier than a hydrogen molecule.
Detailed explanation-2: -Helium is the smallest element in the periodic table. Its size is 31pm while the size of hydrogen is 53pm.
Detailed explanation-3: -This is because helium is less dense. Because helium is lighter that air, a helium balloon rises, just as an air bubble rises in more dense water. Hydrogen is another gas lighter than air; it’s even lighter than helium. Hydrogen, however, is not used in balloons and this demonstration shows why.
Detailed explanation-4: -Answer and Explanation: The value of the mass number of hydrogen is 1, while the mass number of the helium is 4. Considering the mass number, the helium is four times heavier than that of the hydrogen element.