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Atomicity

In isotones t...

Question

In isotones the atomic number and mass numbers are:

A

same

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B

different

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C

equal

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D

zero

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Solution

The correct option is A different
Isotones are atoms of different elements having same member of neutrons but different atomic number and atomic mass.

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Q. Observe the following statements regarding isotones :
i)

^{39} K_{19}

^{40} C A_{20}

are isotones
ii) Nuclides having different atomic numbers (

z

) and mass number (

A

) but same number of neutrons (n) are called Isotones
iii)

^{19} F_{9}

^{23} N A_{11}

are isotones .
The correct answer is

Q. Isotones have same number of atomic mass:

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

Q. Match List I with List II and select the correct answer by using the codes given below.
List I List II
A. Isotopes 1. atoms having same atomic number but different mass numbers
B. Isobars 2. atoms with same number of neutrons but different atomic numbers
C. Isotones 3. atoms with same mass number but different atomic numbers

Q. An element is represented by

_{Z} X^{A}

, where Z is atomic number which is also equal to number of proton, A is mass number and X is symbol of the element.
Mass number (A) = Number of protons (Z) + Number of neutrons.
Isotopes: Atoms having same number of proton
Isobar: Elements having same mass number
Isotones: Elements having same number of neutron (A-Z)

An isotone of

_{40}^{90} Z r

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