14. Which family of elements always forms ions with an oxidation number (charge) of +2 in compounds?

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

Which are forms of frozen water? check all that apply. dew frost hail rain sleet

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit