What element has an atomic number of 20 and two valence electrons in its valence shell?

What is the mass (in grams) of 1.25 mole of sodium metals? a. 1.53 x 10^25 g b. 40.1 g c. 28. 7 g d. 7.53 x 10^23 g

A balloon is taken to a mountain top and inflated with helium to a volume of 5.0 L. The balloon is then released and rises to an altitude where the helium has a new volume of 25.0 L and a pressure of 0.18 atm.

What is name of the final product protein digestion?

What is the relationship between lattice energy and bond strength? A. the higher the lattice energy, the stronger the bond B. the higher the lattice energy, the weaker the bond C. lattice energy does not affect bond strength

A photon has 8.0 * 10-15 J of energy. Planck's constant is 6.63 * 10-34 J•s. What is the frequency of the photon

If this fossil is 65 million years old, what could this fossil suggest about organisms alive today? A. If it is similar to any two modern species, it could be a common ancestor of these species. B.

A compound composed of electrically chargerd atoms is called?

If 5.0mL of HC2H30 require 4.96mL of 0.9581 M NaOH to just consume the HC2H302, what is the concentration of the HC2H3O2? If necessary, show the calculation on a separate sheet of paper, scan, and submit with your lab report.

How many formula units of CaSO4 are in 17g of CaSO4?

Which of these would be an appropriate way to describe the concentration of orange candies? Check all that apply the number of orange candies divided by total number of candies the mass of orange candies divided by total mass of candies the volume