EASY
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A Positively charged ion is also called?

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Important Questions on Structure of Atom

MEDIUM
A substance on treatment with dilute H2SO4 liberates a colourless gas which produces (i) turbidity with baryta solution and (ii) turns acidified dichromate solution green. The reaction indicates the presence of
HARD
The half-life of a radioisotope is 4 hours. If the initial mass of the isotope was 200 g, the mass remaining after 24 hours undecayed
EASY
Hydrogen contains three types of atoms (H11 protium, H12 deuterium, H13 tritium). These atoms are
MEDIUM
Which one of the following is cation 
MEDIUM

The following is the correct decreasing order of the ionic radii- 

EASY
The number of protons in one atom of an element X is 8. What will be the number of electrons in its ion X-2?
EASY

Give one phrase for the following statement:

Process of formation of ions from molecules which are not in the ionic state.

MEDIUM
Isotopes have the same chemical properties but different physical properties. Explain.
EASY
The electrons present in the outermost shell of an atom are known _____ .
MEDIUM
Oxygen has three isotopes: O16 , O17, O18. How do the atoms of these isotopes differ?
EASY
Give a reason for different atomic masses of the isotopes of an element.
EASY
Which of the following is not an isotope of hydrogen atom?
MEDIUM

 What are isotopes? How do the three isotopes of oxygen differ?