EASY
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The symbol of the element Einsteinium is Em.

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Important Questions on Atom, Molecule and Chemical Reaction

EASY

Write the complete symbol for the atom with the given atomic number (Z) and atomic mass (A)

Z=17, A=35

EASY
Which of the following symbols of elements are incorrect? Give their correct symbols
(a) Cobalt             CO 
(b) Carbon             c
(c) Aluminium         AL 
(d) Helium             He
(e) Sodium             So 
 
MEDIUM
The modern atomic symbols were proposed by 
EASY
Which of the following is the symbol for copper?
MEDIUM

Write symbols of the following elements and the radicals obtained from them, and indicate the charge on the radicals.

Mercury, potassium, nitrogen, copper, sulphur, carbon, chlorine, oxygen.

MEDIUM
Define the term symbol of an element. Why are Dalton's symbols not used in chemistry?
HARD

Complete the following table:

S. No Element Symbol
1. Carbon  
2. Magnesium  
3. Sodium  
4. Gold  
5. Chlorine  
6. Aluminium  
7. Copper  
8. Hydrogen  
9. Potassium  
10. Oxygen  

 

MEDIUM
What is the significance of the symbol of an element?