The circles, or orbits, for electrons are called energy levels. Each level can hold only a certain number of electrons. Add electrons to each level until you can't add any more. How many electrons can each level hold?

Which element has the smallest atomic weight? Which element has the greatest atomic weight?

Compare the mass number and atomic number for isotopes of an element

If 450.0 mL of a 0.500 M solution is mixed with 200.0 mL of water, what is the molarity of the new solution? A. 0.346 M B. 0.625 M C. 1. 86 M D. 2.50 M

Find the element that has the same chemical properties as magnesium, but fewer protons

the molecule structure of water contains two atoms of hydrogen and one of oxygen, water turns to vapor what happens to molecule structure

Cracks in rocks chemical or mechanical

A large boulder falls from an underwater ledge and crashes on the floor of the ocean. A pod of dolphins is 800 meters away. Determine how long it takes for the sound of the crash to reach the dolphins. A) 0.5 sec B) 0.3 sec C) 2.3 sec D) 1.9 sec

Given 4.80g of ammonium carbonate, find: Number of moles of the compound Number of moles of ammonium ions Number of moles of carbonate ions Number of moles of hydrogen atoms Number of hydrogen atoms

The density of water is 1.0 g/cm3 will rubbing alcohol float with a density of 0.81 g/cm3

Write an equation that shows the formation of the phosphide ion from a neutral phosphorus atom.