How is the cell of a one-celled organism different from the cells in man-celled organisms?

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Which terms are used to identify pure substances