Before Mendeleev, Newland observed a distinct pattern in the elements and proposed the law of octaves. What were his conclusions

Why do we use the course wheel first then the fine focus?

An atom of an element forms a 2 + ion. In which group on the Periodic Table could this element be located? (1) 1 (3) 13 (2) 2 (4) 17

What should Molly do to treat her burn?

The ksp of cadmium carbonate, cdco3, is 1.0 * 10-12. calculate the solubility of this compound in g/l.

A sample of copper wire with a mass of 1.659 g is heated with excess powdered sulfur until the copper has combined with the sulfur, and all the extra sulfur has been burned off. The final product (a sulfide of copper) has a mass of 2.080 g.

Which types of orbitals are found in the principal energy level n = 4? A. S, d B. S, p, d, f C. S, p D. S, p, f E. S, d, f

Transport means to move something from one place to another. True False

What are two reasons that ocean water sinks in the Arctic Ocean? A. The surface water is warmer and less salty than normal. B. The surface water is warmer and more salty than normal. C. The surface water is colder and less salty than normal. D.

Which statement best describes the conductivity of weak electrolytes, such as weak acids and bases? A) Weak electrolytes do not dissolve in water and can not conduct electricity.

Two speakers are placed side by side and are described as having constructive interference. How do you know when constructive interference of sound waves has occurred?