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The symbols of the elements cobalt, alum...

The symbols of the elements cobalt, aluminium, helium and sodium respectively written by a student are as follows. Which symbol is the correct one ?

A

`CO`

B

`AL`

C

`He`

D

`So`

Text Solution

Verified by Experts

The correct Answer is:
C
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LAKHMIR SINGH & MANJIT KAUR-ATOMS AND MOLECULES-Exercise
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  7. Magnesium and oxygen combine in the ratio of 3 : 2 by mass to for...

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  8. When 5g of calcium is burnt in 2g of oxygen, then 7 g of calcium o...

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  9. An liquid compound X of molecular mass 18 u can be obtained from a n...

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  10. One of the forms of a naturally occurring solid compound P is usually...

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  11. What do we call those particles which have more or less electrons t...

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  12. What do we call those particles which have : (a) more electrons ...

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  13. Define 'formula mass' of a compound.

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  14. What do we call those particles which are formed : (a) by the gain o...

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  15. State whether the following statements are true or false : (a) A ...

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  16. Write dow the formulae for the following compounds : (a) Calcium o...

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  17. An element Z has a valency of 3. What is the formula of oxide of Z ?

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  18. What is the name of a particle which contains 10 electrons, 11 protons...

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  19. Name the particle which has 18 electrons , 18 neutrons and 17 protons...

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  20. Fill in the following blanks with suitable words : (a) The particl...

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