A scientist to study in a sample of an unknown substance do scientist determine's with the substance is a metalloid with four valence electrons. Which two elements could the unknown be

An isotope undergoes radioactive decay by emitting radiation that has a - 1 charge. What other characteristic does the radiation have? some shielding required no mass large mass high penetrating power

A gas changes directly to a solid during ... fusion saponification depositon decomposition

1. What does an element's position on the periodic table tell you about the element?

A marathon is a race that commemorates the run made by a Greek soldier, Pheidippides, that took place in August 490 BC. The soldier ran 26.2 mi. How many kilometers did he run?

A hydrate of CoCl2 with a mass of 6.00g is heated strongly. After cooling, the mass of the anhydrate is 3.27g. a) How many grams of H2O were lost from the hydrate?

What force can move the oceans

How many moles of NO3 are there in 6.2g

Which compound will conduct electricity when it is dissolved in water? a. CH4 b. CuSO4 c. C6H6 d. C6H12O6

Peter is 5 ft, 11 inches tall. Paul is 176 cm tall. Who is taller?

Which is the MOST accurate description about how the different types of feedback mechanisms work