Which atom in the ground state has a stable valence electron configuration?

(1) Ar (2) Al (3) Si (4) Na

6 small glass beads are found to weigh 9.34 g. The beads are placed in a graduated cylinder filled with ethyl alcohol (density 0.78 g/mL). The reading of the liquid in the cylinder before the beads were added is 21.5 mL.

What is the 54th element on the periodic table?

A compound is 25.9% nitrogen and 74.1% oxygen find the empirical formula

The average adult human burns 2.00x20^3 kcal per day in energy. What is this rate in kJ per hour?

Which of the following types of organelle is most important in providing a cell with energy? A. mitochondria B. nuclei C. vacuoles D. cell membranes

Nonrenewable resources are natural resources that are limited in supply and cannot be replaced as quickly as they are used up. True or false

Which method for treating arthritis is an example of pseudoscience? diet drugs exercise magnets

Only a small portion of the organisms that lived in the geologic past have been preserved as fossils. Which condition best increases the chance that an organism will become fossilized?

Which one of the following electron transitions does not correspond to an absorbtion of a quanta of light? 1. n = 4 to n = 6 2. n = 7 to n = 5 3. n = 2 to n = 5 4. n = 2 to n = 6 5. None of the Above

Which atom has a change in oxidation number of - 3 in the following redox reaction K2Cr2O7 + H2O + S - - > KOH + Cr2O3 + SO2