Eric wants to perform an investigation on red blood cells, but before beginning his investigation, he wants to learn more about them. which of the following is an appropriate reference material that eric could use to learn more about red blood cells? a. a science-fiction book about blood b. a scientific journal c. a newspaper editorial d. a friend from school

What is the percent by mass of magnesium sulfate in mgso4.7h2o

How many atomic mass units are equal to 1.672×10−24 g of protons?

The image compares the arrangement of electrons in two different neutral atoms. a figure labeled atom q has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has six black spheres. to the left of this figure is another figure labeled atom p. atom p has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has seven black spheres. which of the following best explains the position of the two atoms in the periodic table? atom p has an estimated zeff of 7 and is therefore to the left of atom q, which has a zeff of 6. atom p has an estimated zeff of 7 and is therefore to the right of atom q, which has a zeff of 6. atom p has an estimated zeff of 5 and is therefore below atom q, which has a zeff of 4. atom p has an estimated zeff of 5 and is therefore above atom q, which has a zeff of 4.