A single atom of an element has 21 neutrons, 20 electrons, and 20 protons. Which element is it? K
Zr
Ca
Sc

Which diagram represents a gas that has been ionized?
diagram 1
diagram 2
diagram 3
diagram 4

Which of these is the result of scientific research and not engineering? a. a new shoe design that features air cushioning for more comfort and protection b. the creation of glass with uv protection. c. a conclusion about diet commonalities among diabetics. d. the development of a smaller, more compact missile.

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

Which suspect most likely committed the robbery and how do you know