A chemist weighed out 20.7 g of sodium. Calculate the number of moles of sodium she weighed out

What is the total number of valence electrons in a sulfide ion in the ground state? (1) 8 (3) 16 (2) 2 (4) 18

Which of the following is most likely an indication of a chemical change? A. A loud sound when an MP3 player is turned on B. A loud sound when someone claps their hands C. A loud sound when a starter's pistol is fired at a race D.

A Tesla roadster electric vehicle has a MPGe (Miles per Gallon equivalent) of 102 miles per gallon. A Ford F-150 has a rating of 21 MPG. The weight of the electric battery in the Tesla is 1062 lb. The volume of the gas tank in the F-150 is 83.2791 L.

What type of nuclear decay is shown by the reaction below? 238/92 U - - > 4/2 HE + 234/90 TH

Which element is in 3 period group 2

Rutherford's famous gold foil experiments shot heavy particles at a thin sheet of gold foil. What did he observe, and why did these observations eventually result in the addition of a nucleus to the atomic model?

In the Periodic Table, what is the relationship between two elements that are placed side-by-side in a row? A. The element on the left has one more electron. B. The element on the left has one more proton. C.

What are two traits of pseudoscience

What will happen if an electric current is flowing through a cord and a magnet is brought near the cord?

Lithium has two isotopes. Li-6 and Li-7. Li-6 mass = 6.015121amu Li-7 mass = 7.016003amu Lithium Mass = 6.94049amu What is percent abundance of Li-6? I know that there is an equation: 6.