This table shows the mass of one atom for five chemical elements.
Use it to answer the question given.


a. Which is the heaviest element?
b. Which element is lighter. Silver or Titanium?
c. List all five elements in order from lightest to heaviest.

Observe the figure and answer the questions given below. Which element is used in it?

Observe the figure and answer the questions given below . (c) Which element is used in it ?

Consider the elements of period 2 in the modern periodic table. Answer the following questions with explanation. Which is the most electropositive element in this period?

The following table shows the position of five elements A, B, C, D and E in the modern periodic table. Answer the following giving reasons: (i) Which element is a metal with valency two? (ii) Which element is least reactive? (iii) Out of D and E which element has a smaller atomic radius?

Which scientist arranged the Periodic Table of Elements in the order of increasing atomic masses?

Observe the diagram given below and answer the questions : (c ) Where element is used in it ?