Which is a property of matter that you CANNOT observe just by looking at an object? A color
B temperature
C shape

temperature

Explanation:

If you see a hot red ball then you know the color, red, and the shape, a ball, but you don’t know it’s hot.

periodic trends is an atom that gets larger as the number of electronic shells increase, 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 right of a certain period.