The atomic number of a non-metal 'X' is 8.
(a) Write the period number and the group number of 'X'.
(b) Draw the electron dot structure of its molecule.

In electron dot structure, the valence shell electrons are represented by crosses or dots. (a) The atomic number of chlorine is 17. Write its electronic configuration. (b) Draw the electron dot structure of chlorine molecule.

The atomic number of an element X is 3. What will be the number of electrons in its ions X^(3+) ?

The atomic number of an element 'X' is 34. Then it is present in ________ period and ______ in group.