Which element has exactly five electrons in the highest principal energy level (the outer shell) ?

a. B

b. Ba

c. P

d. Mn

What is the main cause of increased erosion

Describe the relationship between Sun Angle and Sun Length. Explain this change occurs ... ?

Which statement is true about oxygen and rocks? Both are mixtures. Both are pure substances. Oxygen is a mixture and a rock is a pure substance. Oxygen is a pure substance and rocks are mixtures.

What would happen if an organ in the digestive system stopped working

Write the balanced net ionic equation for the reactions that occur when the given aqueous solutions are mixed. Include the physical states. A. nitric acid, HNO 3, and calcium hydroxide, Ca (OH) 2 net ionic equation: B.

Around 1910, Rutherford bombarded gold foil with alpha particles. Most of the alpha particles passed straight through. To his surprise, a smaller number were deflected by 180°. This summary recounts the scientific discovery of A.

What is the density? Mass = 120 g Volume = 96 mL

A spoonful of salt is stirred into a pot of water. The salt is a

What are some catchy projects titles for the question, "What liquids cause the most tooth decay?"

Show that the speed of an electron in the nth bohr orbit of hydrogen is αc/n, where α is the fine structure constant. what would be the speed in a hydrogen-like atom with a nuclear charge of ze?