In a particular experiment at 300 , drops from 0.0225 to 0.00669 in 190 . The rate of disappearance of for this period is .

a. 4.16×10^−5
b. 8.32×10^−5
c. 1.20×10^4
d. 1.66×10^−4
e. −1.54×10^−4

Select all that apply. a beta particle: is electromagnetic energy is an electron has zero charge is emitted from the nucleus has a +2 charge has a -1 charge

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.