The Periodic Table is arranged by properties:metals (mostly to the of table,) metalloids(along the , and nonmetals) ( mostly to the of table) . It is also arranged by chemical properties, including reactivity. Elements in the same vertical group have the same number of electrons, and elements in the same horizontal period have the same number of shells.

What does a particular point on a line of a phase diagram represent? o a. the maximum temperature a substance can exist at without bonds breaking b. the pressure created by the kinetic energy of molecules at a particular temperature c. the melting point or boiling point of a substance at a specific pressure d. the conditions in which temperature and pressure have equal effects on a substance

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

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.