Chemistry, 17.07.2019 10:50 malakabdulah5792
Mendeleev’s principle of chemical periodicity states that when the elements are arranged according to their atomic numbers. this periodic law allows elements with similar properties to appear at regular intervals. predict the group of elements and their number of valence electrons that will combine in a 2: 1 ratio to with sodium. a) bromine, chlorine, iodine, 7 b) sulfur, selenium, polonium, 6 c) hydrogen, fluorine, potassium, 1 d) calcium, phosphorus, tellurium, 2
Answers: 1
Chemistry, 22.06.2019 10:30
Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.
Answers: 1
Chemistry, 22.06.2019 12:30
The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms
Answers: 1
Chemistry, 22.06.2019 19:20
Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?
Answers: 3
Mendeleev’s principle of chemical periodicity states that when the elements are arranged according t...
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