Which Group On The Periodic Table Of The Elements Contains Elements That React With Oxygen To Form Compounds With The General Formula X2O?

In a periodic table elements are arranged according to their atomic numbers. Atoms are classified into groups and periods in a periodic table. In periods, the arrangement of elements is based upon the energy levels of the atoms of the elements. In groups elements are grouped according to the number of electrons in the outer most orbit of the elements. The elements of first group are combined with oxygen to give compounds of general formula X₂O. The elements of group one are hydrogen, lithium, sodium, potassium, rubidium, cesium and francium. For example;

2H₂ + O₂ ------> 2H2O

4Na + O₂ ------> 2Na₂O

4Li + O₂ ------> 2Li₂O