Which of the following events fail to follow the law of conservation of matter? Select the correct answer below A) Burning wood for a fire
B) Freezing water into ice cubes
C) The decomposition of MgCl, into Mg and Cl
D) None of these

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.

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.