Mendeleev found that when he arranged the known elements according to their atomic mass, the entries in the table exhibited a pattern of chemical properties that repeated itself in groups of eight elements. This led to the generalization now known as:
A. an atomic model.
B. valance electrons.
C. the periodic table.
D. the octet rule.
D. the octet rule.
You might also like to view...
Which of the following statements about antidiuretic hormone (ADH) in prairie and montane voles is not correct?
A. The receptor for ADH is found in the kidney where it contributes to water conservation and in the brain where it influences behavior. B. Both the prairie vole and the montane vole produce ADH. C. The ADH receptor differs between the prairie vole and the montane vole. D. The ADH gene with is distinct regulatory region was taken from the prairie vole and inserted into the montane vole. The prairie vole then became promiscuous. E. The regulatory sequence and ADH coding region of the prairie vole was inserted into the montane vole which then became more likely to pair bond.
Which of the following is indicated by an age structure diagram that narrows to a sharp point at the top?
a. The population is growing rapidly. b. The population is growing slowly. c. The population remains stable. d. The population is decreasing.
Polyploid organisms ________
A) are transgenic B) are created from ES cells C) are knockout organisms D) have different numbers of each chromosome E) have extra complete sets of chromosomes
Following fertilization, the somatic cells of humans divide by:
a. apoptosis b. mitosis c. meiosis d. DNA replication