Study the table and answer the questions given below

a. Write down the atomic number and mass number of each element.
b. Identify elements X and Y.

Study the figure given below and answer the questions that follow : Identify the gas Y.

Study the picture given below and answer the questions that follow: Identify the organism

Study the figure given below and answer the question that follow : Identify the gas Y.

In the table given below, six elements are shown with their atomic numbers given in parenthesis. Number of valence electrons in atom A.

In the table given below, six elements are shown with their atomic numbers given in parenthesis. Number of shells in atom E.

How is mass number (A) and atomic number (Z) of an element (X) represented?

Study the picture given below and answer the question: Identify the type of pollution.

The following table represents the first three periods of the modern periodic table . Study the table and answer the questions that follow How many electrons are present in the valence shell of the element with the atomic number 18?

Study the diagram given below and then answer the question that follow : Identify the cell.