An element from column 1A on the periodic table will combine with an element from column 7A on the periodic table in a one-to-one ratio.   How many more electrons does an element in column 7A need to fill its shell?

When an element from column 1A and and element from column 7A react, what happens to the valence electrons as the product is formed?

We do have rovers on Mars looking at surface rocks. Scientists were very excited when the rovers discovered layers of sedimentary rock that included both clastic and chemically precipitated material. Why was this exciting?

Which atom has the largest electronegativity, according to this graph? Image Description Graph of electronegativity (y-axis) versus atomic number (x-axis). Hydrogen, atomic number 1, is shown with an electronegativity of around 2.1. Lithium, atomic number 3, to Fluorine, atomic number 9, is shown starting at an electronegativity of 1 with Lithium and going up diagonally to Fluorine with an electronegativity of 4. Sodium, atomic number 11, to Chlorine, atomic number 17, is shown starting at an electronegativity of 0.9 with Sodium and going up diagonally to Chlorine with an electronegativity of 3.1. Potassium, atomic number 19, to Bromine, atomic number 35, is shown starting at an electronegativity of 0.8 with Potassium and curving up to an electronegativity of 1.9 where the atomic number is 27 to 29, before going diagonally up to Bromine with an electronegativity of 3.

Several of the elements listed above are gases at room temperature. If you have a container of, for example oxygen, and you heat it up, what happens to the pressure and why?

If they placed a detector at the slits in the experiment described above to measure which slit each electron went through, what would happen?

Both fission and fusion can result in a release of energy. Why?

If you attempt to carefully measure the current position of a single electron, what will happen?

Which of these is evidence for the Big Bang?

Fairly young fossils are often radiometrically dated using carbon-14 dating. The half life of carbon-14 is approximately 6000 years. A sample of carbon taken from a fossil is found to contain 1/8 the carbon-14 you would find in a sample of carbon of the same size taken from something alive today. From this information, the fossil is approximately how old?