Looking at the periodic table, which pair of elements will have the same number of valence electrons? A. silicon and germanium B. nitrogen and oxygen C. silicon and phosphorus D. hydrogen and helium

Looters break a statue into pieces. How do you expect the weathering of pieces of rock to change?

Which information would be required to determine the mass number of nitrogen?

Which elements are the most colorful

What property of lasers causes coherent light to be emitted? a. different intensities c. monochromaticity b. light amplification d. stimulated emission

When a substance is heated, what causes its properties to change?

What is the name of the compound Sr3N2?

The water softener discussed here relies on precipitation softening also known as ion exchange. based o hte reactants used, what ions would remain in the softened water thaat would be consumed buy the homeowners

What would be the best technique to separate a soluble solid from a solution, like separating salt from a mixture of salt water?

What are metalloids used for

Which scientist developed the quantum mechanical model of the atom? a. Albert Einstein c. Niels Bohr b. Erwin Schrodinger d. Ernest Rutherford