Escriba los símbolos, números atómicos, grupo de los átomos con las siguientes configuraciones: 1x2 2x2 2p3
1x2 2x2 2p6 3s1
1x2 2x2 2p6 3x2 3p5
1x2 2x2 2p6 3x2 3p6 4s2

Which statement best describes the oxidation numbers of the atoms found in magnesium chloride? a. magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number. b. magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number. c. magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number. d. magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Which of the following are sources of revenue for media companies? a. direct sales to producers b.advertising and subscriptions c. online purchase d. capital investments