In an experiment 0.1g samples of Na20 ,MgO. P4O10 and SO2 are added to separate 100 cm3 volumes of water a) Na2o. B) MgO. C) P4O10 d)SO2

oh it is true if thats what you are asking

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.