H2 + N2 --> NH3 How many moles of hydrogen is necessary to produce 0.30 moles of ammonia?​

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.

the objects have the same charge is correct.

nathan lee