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Atomic Number and Mass Number

Isotones have...

Question

Isotones have same number of atomic mass:

A

True

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B

False

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Solution

The correct option is B False
Isotones/ Isoneutronic species / Isotonic :
They are the atoms of different element which have the same number of neutrons.

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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

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. 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. In isotones the atomic number and mass numbers are:

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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