18. What element has 81 protons in the nuclei of its atoms?

How many electrons can occupy the s orbitals at each energy level?

Which of these is an effect of weathering and erosion in the hydrosphere? A Wind can weather and erode rock formations B Plant roots can weather rocks C Rocks are weathered and eroded by water, wind, living things, and ice D Water and glaciers can

In what kind of reaction does a single compound produce two or more simpler substances

what is the height of a block with a length of 10cm a width of 5cm a mass of 50g and a density of 8.64g/cm3

Which of these statements is true about chemical reaction rates? A. The reaction rates cannot decrease B. the reaction rates cannot increase C. The reaction rates can change D. The reaction rates are always constant

What type of chemical reaction is C6H6 + CI2 = C6H5CI + HCI

True or False : During neap tides, low tides are highest because the Sun, Earth, and the Moon form a right angle.

Determine the number of protons, electrons, and neutrons for cobalt with a charge of + 6 and a mass of 61.

Which of the following is false about a spontaneous chemical reaction that generates electricity:a. Oxidation and reduction half-reactions occur at electrodes in electrochemical cells. b.

What change would you expect on the rate of theSN2 reaction of 1-iodo-2-methylbutane withcyanide ion if the nucleophile concentration isunchanged and the alkyl halide concentration isdoubled?