The atomic number of elements X and Y are 8 and 9 respectively. Choose the correct statement(s) regarding the compound formed by these two elements.
The electronic configuration of two elements A and B are 2,8,3 and 2,8,7 respectively. Find the atomic number of these elements. State the nature and formula of the compound formed by the union of these elements.
Element A,B and C have atomic numbers 9, 20, and 10 respectively. Write down the formula of the compound formed by two of the above elements.