Elements have three or fewer electrons on the outer energy level are classified as what?

Using the periodic table, identify the lightest member of each of the following groups: (a) noble gases (b) alkaline earth metals (c) alkali metals (d) chalcogens

What is the difference between thermal decomposition and combustion

Which examples demonstrate responses to stimuli? Check all that apply. A. A Venus flytrap closes on a fly. B. Large amounts of bacteria are present in a soil sample. C. A plant grows toward the sunlight. D. A rabbit has both white and black fur. E.

Which of the following statements about matter is false? A. The amount of matter increases slightly as water changes state. B. The amount of matter in an object remains the same during changes in state. C. Matter is neither created nor destroyed. D.

Which of the following can be expected to occur as climate changes continues on Earth? A] decreased melting of sea ice B] decreased migration of pets and pathogens C] increased freshwater sources D] increased coastal flooding

How do chemists know that an oxygen molecule have unpaired electrons?

How is firelight produced

Systems in nature tend to undergo changes toward (1) lower energy and less disorder (2) lower energy and more disorder (3) higher energy and less disorder (4) higher energy and more disorder

Which of the following pairs does not share the same empirical formula? 1) CH2O and C3H6O3 2) PbCl2 and PbCl4 3) NO2 and N2O4 4) C3H12 and CH4

Which subatomic particle is the lightest? (a) neutron (b) proton (c) electron (d) all of the above (obviously not the last one, I guess)