According to the periodic table, how many protons are in the nucleus of one atom of the element iron?

a. 9

b. 26

c. 55.85

d. 77

What have scientists been able to use to create the Geologic Time Scale?

What is the study of the functions of the cells, tissues, organs, and organ systems of the living organism?

An archaeologist discovered some charcoal at an excavation site. He sent the samples to a lab for C-14 dating, knowing that the half-life of C-14 is approximately 5,600 years.

Chromium can form either a 2 + or a 3 + ion. what is the stock name for the chromium ion with the 3 + charge?

Determine the mass of NH4Cl that must be dissolved in 100. grams of H2O to produce a saturated solution at 70.°C.

Which orbital notation represents a noble gas in the ground state

c. When we heat water up by the Bunsen burner, what temperature is the boiling water? After 10 minutes

Assuming that air contains 78 percent N2, 21 percent O2 and 1 percent Ar, all by volume. How many molecules of each type of gas are present in 1.0 L of air at STP?

Two children are playing tag. Child A who is doing the chasing can run 100m in 24 seconds Child B is running away from child A and can run 64m in 21 seconds.

What ion does a base increase