Pls I need it fast , its for my homework and I can’t find it

What is the rate of change in a objects position?

When electrons are added to the outermost shell of a carbon atom, it forms--an anion that has a larger anion that has a smaller cation that has a larger cation that has a smaller radius.

Which system of units is used by only a small number of countries in the world, including the u. s.