A main-group element has an outer electron configuration of ns2np3ns2np3. What charge is likely for an ion of this element? a. 3+
b. 1+
c. 2+
d. 1−

Which fact represents evidence for the big bang theory?

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

Rank the four gases (air, exhaled air, gas produced from from decomposition of h2o2, gas from decomposition of nahco3) in order of increasing concentration of co2