First to organize the elementsby atomic mass; noticedpatterns in every 8th element;law of octaves; left no gaps forfuture discovery; law ofoctaves did not work for largerelements.DobereinerSeaborgMendeleevNewlandsHe synthesized many elementspast Uranium and reorganizedthe table by adding an f-block.SeaborgО МеyerMoseleyJanet

CORRECT choices are:- NEWLANDS SEABORG

Answered: First to organize the elements by…

Chemistry & Chemical Reactivity

9th Edition

ISBN:9781133949640

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter2: Atoms Molecules And Ions

Section: Chapter Questions

Problem 164SCQ

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Similar questions

What are the symbols of the following nonmetals: fluorine, chlorine, bromine, sulfur, oxygen, phosphorus?
As pure elements, all of the halogens are diatomic molecular species. Their melting points are: F2. 54K; Cl2, 172K; Br2,. 266K; and I2, 387K. Using the Periodic Table, predict as best you can the molecular formula of elemental astatine, At, the only radioactive element in this family. Also predict whether it will be a solid, liquid, or gas at room temperature. Elemental formula: ______ Phase at room temperature: ______
One of the best indications of a useful theory is that it raises more questions for further experimentation than it originally answered. Does this apply to Daltons atomic theory? Give examples.
Little is known about the properties of astatine, At, becauseof its rarity and high radioactivity. Nevertheless, it is possiblefor us to make many predictions about its properties. (a) Doyou expect the element to be a gas, liquid, or solid at roomtemperature? Explain. (b) Would you expect At to be a metal,nonmetal, or metalloid? Explain. (c) What is the chemicalformula of the compound it forms with Na?
The following diagram is a representation of 20 atoms ofa fictitious element, which we will call nevadium (Nv).The red spheres are 293Nv, and the blue spheres are 295Nv.(a) Assuming that this sample is a statistically representativesample of the element, calculate the percent abundanceof each element. (b) If the mass of 293Nv is 293.15 amu andthat of 295Nv is 295.15 amu, what is the atomic weight of Nv?
The decay series of Uranium 238 includes 3 isotopes. Which one has the greatest abundance in a sample of pitchblende ?
Determine whether each of the following statements is trueor false. If false, correct the statement to make it true: (a) Thenucleus has most of the mass and comprises most of the volumeof an atom. (b) Every atom of a given element has thesame number of protons. (c) The number of electrons in anatom equals the number of neutrons in the atom. (d) Theprotons in the nucleus of the helium atom are held togetherby a force called the strong nuclear force
An atom of rhodium (Rh) has a diameter of about2.7 x 10-8 cm. (a) What is the radius of a rhodium atom inangstroms 1A° 2 and in meters (m)? (b) How many Rh atomswould have to be placed side by side to span a distance of6.0 μm? (c) If you assume that the Rh atom is a sphere, whatis the volume in m3 of a single atom?
The first atoms of seaborgium (Sg) were identified in 1974.The longest-lived isotope of Sg has a mass number of 266.(a) How many protons, electrons, and neutrons are in an266Sg atom? (b) Atoms of Sg are very unstable, and it is thereforedifficult to study this element’s properties. Based on theposition of Sg in the periodic table, what element should itmost closely resemble in its chemical properties?
A sample of a uranium compound is found to be losingmass gradually. Explain what is happening to the sample.
( a ) Eva l u a te t h e expre s s i o n s 2 * 1, 2 * 11 + 32,2 * 11 + 3 + 52, and 2 * 11 + 3 + 5 + 72. (b) How do the atomic numbers of the noble gases relate to the numbersfrom part (a)? (c) What topic discussed in Chapter 6 is thesource of the number “2” in the expressions in part (a)?
In the early 1900s, Ernest Rutherford produceda beam of very small positive particles and directed it at a thinpiece of gold foil just a few atoms thick. Most of the particlespassed through the foil without changing their path; very rarely, aparticle was deflected. What conclusions can you draw from thisexperiment about the structure of an atom?

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