The atom having the smallest atomic mass .

The atom having the smallest size.

Name the element having the simplest atomic structure in the periodic table.

The noble gas with the smallest atomic radius

Answer the following questions: Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation. Which of these atoms has smallest atomic radius ?

"_19K,_3Li,_11Na,_4Be .Which of these atoms has smallest atomic radius?

Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following questions with explanation. "_19K,_3Li,_11Na,_4Be. Which of these atoms has smallest atomic radius?

Comlete the following table: The relative atomic masses of some elements in the chart below are given. You have to find the relative atomic masses of the others.

State whether the following statement is True' or False'. If false, write the correct statement for the same. Isotopes have same atomic masses

The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39 respectively. a. Calculate the average atomic mass of element B according to Dobereiner's triads. b. Compare the average atomic mass of B with its atomic mass. c. What could the elements A, B and C be?