If atomic number of an element is 11, the correct name, symbol and valency are :

Which one of the following is the correct order of the valencies of elements Ne, Si, N and Mg?

Which one among the following are the correct symbols for the elements gold, tin and lead, respectively?

Consider the following statement: "Atomic number of an element is a more fundamental property than its atomic mass." Who among the following scientists has made the above statement?

Which of the following sets of elements has the same valency?

Identify the correct pair of elements among the following which are liquid at room temperature and standard pressure.