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

The wave model replaced the Bohr, modified solar system model of the atom because the wave model can explain and predict things when the Bohr model either fails to explain them or provides incorrect predictions. Which of the following is one of the reasons that the wave model is better than the Bohr model?

Use this information to answer the next two questions: This diagram shows one model’s predictions of global temperatures and possible future temperatures. Image Description Graph of global temperatures and possible future temperatures, with greenhouse effect from human activities added. The graph starts 20,000 years ago at the bottom, where the coldest temperatures during ice age peaks. The line starts to curve up, following a natural temperature trend. It curves until it passes a dotted line labeled glaciation threshold, approximately 10,000 years ago. This line is noted as the warmest temperatures of interglacial intervals. The line continues to increases a short distance before rounding off and gradually decreasing. The line splits into two parts shortly after peaking at approximately 8,000 years ago. One part slopes down diagonally and is labeled natural temperature trend. The other part continues horizontally and is labeled Actual Trend. The difference between the two split lines is filled with color, noting greenhouse effects from early agriculture. The actual trend line continues to hardly decrease before entering the rapid industrialization period approximately one to two hundred years ago. The trend line then starts to increase, entering a section of the graph labeled Temperatures above natural range of ice ages. The trend line increases until it passes the present year mark. It then transitions into future activities with a dashed prediction line showing the temperature continuing to increase, even after fossil fuels are marked as depleted, until the curve rounds off and decreases to reunite with the natural temperature trend line that is below.

This figure is a graph of temperature versus time as a material has a constant amount of energy added each minute. Which element does it represent?   

An astronomer discovers brightly glowing disk of gas in space surrounding a neutron star, like the one pictured below. What would they say happened?    Attributions Images NASA, ESA, and Z. Levay (STScI); Radio: NRAO/AUI/NSF GBT+VLA 1.4 GHz mosaic (Dyer, Maddalena and Cornwell, NRAO); X-ray: NASA/CXC/Rutgers/G. Cassam-Chenai and J. Hughes et al.; Optical: F.Winkler/Middlebury College and NOAO/AURA/NSF; and DSS. Full-shell Image of SN 1006 Showing Location of Hubble Observations . (public domain). Via NASA.

When we look at the magnetic field in ancient igneous rocks on the Earth, we find that rocks of the same age have magnetic fields that point in different directions, like the top map below. Someday in the future, scientists would like to make similar measurements on Mars. If we were to measure the magnetic fields trapped in ancient igneous rocks on Mars, scientists expect to find that the magnetic field in rocks of the same age will all point the same direction, like the bottom map. Attributions Images Strebe. Gall–Peters projection SW.jpg . (CC BY-SA 3.0). Via Wikimedia Commons.

According to this graph, what is the current trend in temperatures?

Which of these is true about melting and boiling points in materials made of covalent molecules?

On the periodic table, shown at the top of the test, where can you find atoms with the highest ionization energy?

See figure 1 in the problem above. If the single slit that produced the image at the top is made narrower, what will happen to the area of red light on the screen seen in the top image?