How many valence shell electrons does an atom of aluminum have

The Doppler effect is exhibited in the electromagnetic radiation emitted from which of the following? A: moving objects B: stationary objects C: x rays D: microwave towers

Will bromine react with sodium? Why or why not?

What mineral has the least hardness according to the scale?

Some historians say that the U. S.-Mexican War was inevitable. Do you agree or disagree?

The thin layer that separates a cells contents from the outside environment is the A. cell membrane b. nucleus c. cytoplasm D. endoplamsin reticulum

What burns fuel to release thermal energy

Scientist call an organism that has two different alleles for a trait

The molar mass of water (H2O) is 18.02 g/mol. Yun needs 0.025 mol H2O for a laboratory experiment. She calculates that she needs 72.0 g H2O for the experiment. Yun's calculation was incorrect because she set up her unit conversion incorrectly.

I'm doing isotope homework and I need the find the number of protons, neutrons, and electrons first one is chromium-58 and chromium-63

Trisha and her lab partner were conducting a variety of experiments to produce gases: hydrogen, oxygen, and carbon dioxide. In one experiment, they added a piece of magnesium ribbon to 10 milliliters of hydrochloric acid.