Question

The elements of one short period of the periodic table are given bellow in order from left to right :
Li, Be, B, C, O, F, Ne.

Answer the following.

1)To which period do these elements belong?

2)One which of this period is missing. Which is the missing element and where should it be placed?

3)Which one of the elements in this period shows the property catenation?

4)Place the elements - Fluorine, Beryllium and Nitrogen in the increasing order of Electronegativity.

Answer 1

$Li,Be,B,C,O,F,Ne$ belongs to second period. Nitrogen is the missing elements.

Nitrogen should be placedbetween carbon and oxygen

* Carbon atoms shows catenation properly.

* $F>N>Be$ in terms of electronegativity.