In 1869, Russian chemist Dimitri Mendeleev proposed arranging the known elements by atomic weights and properties in 17
columns with two partial periods of seven elements each followed by two nearly complete periods. Rayleigh and Ramsey
improved the periodic table by discovering the inert gases. In 1911, Henry Moseley subjected elements to x-rays and was able
to derive the relationship between x-ray frequency and number of protons. When Moseley arranged the elements according to
increasing atomic numbers and not atomic masses, some inconsistencies associated with Mendeleev's table were eliminated.
The modern periodic table is based on Moseley's Periodic Law.
Changes in the periodic table from 1800's to the present are based on all BUT ONE of these factors.
A)
peer review
B)
empirical data
C)
fact verification
D)
journal publication
Answers: 3
Biology, 22.06.2019 07:00
8) animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. d) a dog is getting hot in the sunlight, so he moves to a shaded area.
Answers: 3
Biology, 22.06.2019 14:00
The more rapidly sedimentation occurs, the more likely it is that the remains will successfully form a fossil. as sedimentation continues, what happens to the amount of weight settling onto the organism? stays the same increases decreases cuts in half
Answers: 2
In 1869, Russian chemist Dimitri Mendeleev proposed arranging the known elements by atomic weights a...
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