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Assertion: Argon (at mass 39.94) has bee...

Assertion: Argon (at mass 39.94) has been placed before potassium (at mass 39.10) in the modern periodic table.
Reason: In modern periodic table, elements have been placed in order of their increasing atomic numbers.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
A
The atomic number of argon is 18 and that of potassium is 19
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