Nuclides having the same difference in mass number and atomic number, are known as

i s o t o n e s

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i s o m e r s

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i s o b a r s

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i s o t o p e s

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Solution

The correct option is A $i s o t o n e s$
$N u m b e r o f n e u t r o n s = m a s s n u m b e r - a t o m i c n u m b e r$
Number of neutrons are equal to the difference in mass number and atomic number. And species having equal number of neutrons are known as isotone.

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Nuclei with the same number of protons but a different number of neutrons are called isobars

Nuclei with the same number of neutrons but a different atomic number are called isotopes

Nuclei with the same mass number are called isotones

^{39} K_{19}

^{40} C A_{20}

z

A

^{19} F_{9}

^{23} N A_{11}

_{Z} X^{A}

_{40}^{90} Z r

Atoms having same atomic number and different mass numbers are known as __.

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