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

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 of the following natural elements has the highest atomic number?

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?