Viết sự phân bố e của z=1 đến z=10 Lớp 1 chứa phân lớp 1s có 2e
Lớp 2 chứa phân lớp 2s , 2p có 2+6=8e

If 1.8 l of water is added to 2.5l of a 7.0 molarity koh solution, what is the molarity of the new solution

Which of these conditions most likely produces an unstable isotope?

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.