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Which of the following statements are in...

Which of the following statements are incorrect regarding the elements given below?
`""_(19)^(39)U , ""_(53)^(127)V , ""_(17)^(35)W, ""_(35)^(80)X , ""_(18)^(40)Y`
I. The correct order of increasing proton number is `U lt W lt X lt V lt Y` .
II The correct order of increasing mass number is `W lt U lt Y lt X lt V`.
III. There is difference in the orders of proton number and mass number.
IV. The number of protons is equal to number of neutrons in all the given elements.

A

I and IV only

B

II and IV only

C

I and II only

D

II and III only

Text Solution

Verified by Experts

The correct Answer is:
A
Atomic number = Number of protons

Mass number = Number of proton + Number of neutrons
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