Write down the symbol, atomic number and atomic mass of hydrogen. 

Name the metals which react with cold water to form hydrogen. 

Name the metals which react with acids. 

Write down the electronic configuration of hydrogen. 

Write three physical properties of hydrogen. 

State three chemical properties of hydrogen. 

Write down an equation in which hydrogen reduces metal oxides to their respective metals. 

Hydrogen is the lightest gas. Explain with the help of an experiment. 

What are ionic hydrides?