Answer:
An atom gets larger as the number of electronic shells increase; therefore the radius of atoms increases as you go down a certain group in the periodic table of elements. In general, the size of an atom will decrease as you move from left to the right of a certain period.
Explanation:
D it’s quartz on the Mohs scale thing it’s ranked 7
B,speedof light>speed of sound
Chemicals are never classified all depends upon it's physical and chemical properties so the answer is FALSE
