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Many elements have non-integral atomic m...

Many elements have non-integral atomic masses because

A

they have isotopes

B

their isotopes have non-intergral masses

C

their isotopes have different masses

D

the constituents, neutrons, protons and electrons combine to give rational masses

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Non-integral atomic masses are due to isotopes which have different masses.
So, (A) and (C ) are the correct answer.
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ALLEN-ATOMIC STRUCTURE-Exercise - 05[A]
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  2. An atom has a mass of 0.02kg and uncertainty in its velocity is 9.218x...

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  3. Energy of H-atom in the ground state is -13.6eV. Hence energy in the s...

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  4. Uncertainty in position of a particle of 25g in space is 10^(8)m Henc...

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  5. The orbital angular momentum for an electron revolving in an orbit ...

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  6. The number of d-electron retained in Fe^(2) ("At no. of" Fe =26) ion ...

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  7. The de-Broglie wavelength of a tennis ball mass 60 g moving with a ve...

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  8. In Bohr series of lines of hydrogen spectrum, third line from the red ...

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  9. Which of the following sets of quantum number is correct for an electr...

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  10. Consider the ground state Cr atom (Z = 24). The number of electron w...

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  11. The wavelength of the radiations emitted when in a hydrogen atom elect...

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  12. Which one of the following sets of ions represents the collection of i...

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  13. In a malti-electrons atom which of the following orbitals deseribed...

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  14. Which of the following are not isoelectronic speices ?

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  15. Which of the following statement is correct in relation to the hydroge...

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  16. According to Boohr's theory the angular momentum of an electron in 5th...

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  17. Uncertainty in the position of an electron mass (9. 1 xx 10^(31) kg) ...

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  18. Which of the following sets of quantum numbers represents the highest ...

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  19. Which one of the following consitutes a group of the isoelectronic spe...

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  20. The ionization enthalpy of hydrogen atom is 1.312 xx 10^6 J mol^-1. Th...

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  21. In an atom, an electron is moving with a speed of 600 m//s with an ac...

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