please answer all :( 27. How many electrons does 207Pb+2 have?a.80b. 82C. 84d. 12528. How many electrons does Ga+3 have?a.28b. 31С. 34d. 3629. How many neutrons does 20 Bi+3a.80b. 83С. 126d. 2092002

The atomic number of an atom is the number of protons present in the atom. For a neutral atom, the…

Answered: 27. How many electrons does 207Pb+2…

Chemistry In Focus

7th Edition

ISBN:9781337399692

Author:Tro, Nivaldo J.

Publisher:Tro, Nivaldo J.

Chapter3: Atoms And Elements

Section: Chapter Questions

Problem 3E: What defines an element? How many naturally occurring elements exist?

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Similar questions

An element consists of 1.40% of an isotope with mass 203.973 u, 24.10% of an isotope with mass 205.9745 u, 22.10% of an isotope with mass 206.9759 u, and 52.40% of an isotope with mass 207.Y766 u. Calculate the average atomic mass, and identify the element.
An element has the following natural abundances and isotopic masses: 90.92% abundance with 19.99 amu, 0.26% abundance with 20.99 amu, and 8.82% abundance with 21.99 amu. Calculate the average atomic mass of this element.
See the definition for isobars in Question 15. Consider Cr-54, Fe-54, Fess, and Ni-S8. (a) Which of these are isobars? Which are isotopes? (b) What do Fe-S4 and Fe-58 have in common? (c) Which atoms have the same number of neutrons?
Without consulting your textbook or notes, state as many points as you can of Dalton’s atomic theory. Explain in your own words each point of the theory.
One of the best indications of a useful theory is that it raises more questions for further experimentation than it originally answered. How does this apply to Dalton’s atomic theory? Give examples.
Verify that the atomic weight of lithium is 6.94, given the following information: 6Li, mass = 6.015121 u; percent abundance = 7.50% 7Li, mass = 7.016003 u; percent abundance = 92.50%
2.41 How does the periodic table help to make the study of chemistry more systematic?
Verify that the atomic weight of magnesium is 24.31, given the following information: 24Mg, mass = 23.985042 u; percent abundance = 78.99% 25Mg, mass = 24.985837 u; percent abundance = 10.00% 26Mg, mass = 25.982593 u; percent abundance = 11.01%
The average atomic masses of some elements may vary, depending upon the sources of their ores. Naturally occurring boron consists of two isotopes with accurately known masses ( 10B, 10.0129 amu and 11B, 11.0931 amu). The actual atomic mass of boron can vary from 10.807 to 10.8 19, depending on whether the mineral source is from Turkey or the United States. Calculate the percent abundances leading to the two values of the average atomic masses of boron from these two countries.
In what way are isotopes of a given element always different? In what way(s) are they always the same?
An atom has a very small nucleus surrounded by an electron cloud. Figure 2.1 represents the nucleus with a diameter of about 2 mm and describes the electron cloud as extending over 200 m. If the diameter of an atom is 1 10-8 cm, what is the approximate diameter of its nucleus?
Your friend tells you about an article that he read in a tabloid that reported the discovery of a new form of carbon containing eight protons in the nucleus of its atoms. He claims that scientists are eager to explore the properties of this new form of carbon. What is wrong with the tabloid's claim? a. Nothing. The claim is believable. b. The claim must be false because an atom with eight protons would be oxygen, which is already known. c. The claim must be false because all forms of carbon are already known.

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27. How many electrons does 207Pb+2 have? a. 80 b. 82 С. 84 d. 125 28. How many electrons does Ga+3 have? a. 28 b. 31 С. 34 d. 36 29. How many neutrons does 20Bi+3 83 b. 83 80 d. 209 a. С. 126