To test the quality of water sources in her area, shameka collects five samples from each water source and tests the quality of each sample.

which important step of scientific design is shameka conducting?

repetition
replication
verification of results
using controlled variables

100 points answer quick the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount