Chemistry
Assertion (A): An alpha particle is the same as a Helium nucleus.
Reason (R): An alpha particle does not have any electron.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Atomic Structure
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Answer
Both A and R are true but R is not the correct explanation of A.
Explanation — An alpha particle contains two protons and two neutrons, same as helium nucleus. Hence the assertion (A) is true
An alpha particle is formed by removing 2 electrons from helium atom. So, it does not have any electrons. Hence the reason (R) is true.
But reason does not explain why alpha particle is same as helium nucleus. Hence reason (R) is not correct explanation of assertion (A).
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Related Questions
Select the correct statement(s) for the diagram shown below.
P — One atom of carbon transfers one electron to each chlorine atom.
Q — One atom of carbon shares four electron pairs, one with each of the four atoms of chlorine.
R — Carbon atom attains neon configuration and chlorine attains argon configuration after the combination.
- Only P
- Only Q
- Only R
- Both Q and R
Assertion (A): The atomic mass of an element is mainly the mass of its nucleus.
Reason (R): The nucleus of an element contains neutrons and protons and the electrons have a negligible mass.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Isotopes of an element have similar chemical properties.
Reason (R): Isotopes of an element have the same atomic number.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Al3+ ion is isoelectronic with Neon.
Reason (R): Both have the same number of electrons.
- Both A and R are true and R is the correct explanation of A.
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- A is true but R is false.
- A is false but R is true.