Which of the following correctly describes a trend from top to bottom in the group 2 (2A) elements on the periodic table? Alonic radius decreases
lonie charge increases
c Alomic number decreases
D Atomic radius increases

Does anyone know a lot about how to: - calculate mass of magnesium metal - calculate the actual yield of magnesium oxide - calculate the theoretical yield of mgo - calculate the percent yield of mgo - determine the percent yield of mgo - determine the average percent yield of mgo i had to do an online lab and its asking these questions but i have no idea where to start or how to be able to find these things. i can post the chart of the data from the lab or if you can tell me exactly how i can find each.

How did planetesmals form planets? a. they broke apart into smaller chunks. b. they collided and stuck together. c. they cooled and pulled ice together. d. they began to rotate.

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland