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The number of neutrons in the element Be...

The number of neutrons in the element Be is

A

4

B

5

C

9

D

13

Text Solution

Verified by Experts

The correct Answer is:
B
Number of neutrons = Mass number - atomic number = 9 - 4 = 5
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MTG IIT JEE FOUNDATION-STRUCTURE OF THE ATOM-EXERCISE ( MULTIPLE CHOICE QUESTIONS -LEVEL-1)
  1. Valency of oxygen is

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  2. Which of the following shows the electronic configuration of Ca^(2+)?

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  3. The number of neutrons in the element Be is

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  4. Which of the following particles is not deflected by a magnetic field?

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  5. Which of the following elements contains only two electrons in the out...

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  6. The charge on the atom having 17 protons, 18 electrons is

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  7. Maximum number of electrons in any orbit is

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  8. Which of the following statements are part of Bohr's model of hydrogen...

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  9. The number of electrons in the valence shell of calcium is

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  10. Na^(+ ) ion is isoelectronic with

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  11. Which of the following is not true for isotopes?

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  12. The valency of an element is

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  13. Which of the following electronic configurations is wrong?

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  14. MgCl2 is the formula for an ionic compound of magnesium and chlorine. ...

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  15. A cation has a positive charge because

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  16. What will be the valency of an atom if its outermost shell contains fo...

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  17. In Rutherford's gold foil experiment most of the alpha-particles pass ...

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  18. Rutherford's model of an atom could not explain its stability. This wa...

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  19. Isotones have

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  20. The main drawback of Rutherford's model of the atom is that

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