The letters $X$ , $Y$ and $Z$ represent different atoms.
$_{19}^{40} X$ $_{19}^{39} Y$ $_{20}^{40} Z$
What can be deduced from the proton numbers and nucleon numbers of $X$ , $Y$ and $Z$ ?

X

and

Y

are the same elements

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X

and

Z

are the same elements

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X

has more protons than

Y

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Z

has more neutrons than

Y

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Solution

The correct option is A $X$ and $Y$ are the same elements
The atoms with same atomic number are atoms of same elements even if their mass numbers are different, So in our case, $_{19}^{40} X;_{19}^{39} Y$ both have same atomic number $(19)$ .
Hence $_{19}^{40} X;_{19}^{39} Y$ are same elements. Thus answer is option A.

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The letters X, Y and Z represent different atoms. 4019X 3919Y 4020ZWhat can be deduced from the proton numbers and nucleon numbers of X, Y and Z?

The correct option is A X and Y are the same elementsThe atoms with same atomic number are atoms of same elements even if their mass numbers are different, So in our case, 4019X;3919Y both have same atomic number (19).Hence 4019X;3919Y are same elements. Thus answer is option A.

The letters $X$ , $Y$ and $Z$ represent different atoms.
$_{19}^{40} X$ $_{19}^{39} Y$ $_{20}^{40} Z$
What can be deduced from the proton numbers and nucleon numbers of $X$ , $Y$ and $Z$ ?