3. Give the number of protons and electrons in each of the following common ions: Nat. Ca²+, Al3+, Fe2+, 1.Fis?-,6?-, and N3-

Needthe meter is the standard unit for: 1) height 2) length 3) weight 4) mass

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

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.