1. A scientist collects data on a sample of Lithium. He determines that 92.3% of the sample is lithium-7 and 7.7% of the sample is lithium-6. Based on this scientist's information, what is the atomic mass of lithium?

Q: A. Explain how you would determine the number of neutrons in a chlorine atom that has a mass number…

A: Given, A chlorine atom has a mass number of 37 Another chlorine atom has a mass number of 35…

Q: What is the mass of 4.91×10214.91×1021 platinum atoms?

A: For  calculating the mass of substance , we have the governing equation  m=NA×Molecular weight ,…

Q: While roaming a parallel universe, you discover the hypothetical element "Z." You obtain a…

A: We need to calculate the atomic weight of the element Z.

Q: The diameter of a zirconium atom is 3.10 Å3.10 Å. Express the radius of a zirconium atom in both…

A: Given The diameter of a zirconium atom is 3.10 Å

Q: 58. Which elements are alkaline earth metals?(a) rubidium(b) tungsten(c) magnesium(d) cesium(e)…

A: The six chemical elements which are present in the second group of the periodic table are known as…

Q: Fill in the blank spots.

A: The atomic number (Z) of an atom is equivalent to the number of protons which is equivalent to the…

Q: The atomic number of nitrogen is 7. What is the mass number of a nitrogen atom with 6 neutrons?

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Q: 1. A sample of magnesium has the following isotopic abundances: Isotopic mass (amu) 23.99 24.99…

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Q: 1. Fill in the blank spaces in the table. Element Atomic Mass Protons Neutrons Electrons number…

A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question…

Q: A carbon atom has a mass number of 12 and an atomic number of 6. How many neutrons does it have?

A: The atomic no. of the atom can be described as the total no. of protons that are present in the…

Q: e terms atomic number, mass number, and atomic mass. Then, (ii) explain what isotopes are and (iii)…

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Q: Find the mass of 236 atoms of tungsten in Kg

A: Tungsten is a chemic element having atomic number 74. Chemical symbol of tungsten is 'W'  According…

Q: 8. 99.759 15.995 Oxygen 8. 0.037 16.995 180 0.204 17.999 8. Isotopic abundance data is given for…

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Q: 1. Potassium naturally consists of 93.10% K- 39 and 6.90% K-41. K-39 has an atomic mass of 38.963707…

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Q: Is the statement inconsistent with Rutherford’s nuclear theory as it was originally stated? Why? A…

A: Given statements, A phosphorus atom has 15 protons in its nucleus and 150 electrons outside of its…

Q: A certain element exists as three different isotopes, 29.1% of all the isotopes have a mass of 75.23…

A: The average atomic mass can be calculated by using Following formula - AAM = (Mass of 1st isotope×%…

Q: j. How is the mass number related to the number of protons, neutrons, and/or electrons? k. Potassium…

A: j) Mass no. is the sum total of no. of protons and neutrons. Mass no.=no. of protons+no. of neutrons…

Q: John Dalton was an English scientist who lived from 1766 to 1844. Dalton's significant contributions…

A: Dalton put forward the theory of matter. It is the oldest theory that explains the nature of matter.…

Q: Use the References to access important values if needed for this question. The atomic weight of…

A: The given chemical element is Cesium (Cs). It is an alkali metal. Given atomic mass is…

Q: 1. What is the mass number of a potassium (K) atom that has 20 neutrons?

A: Atomic number (Z) = Number of protons Mass number = number of protons + number of neutrons

Q: [References] Americium-241 is an isotope of americium used in household smoke detectors. This…

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Q: Potassium naturally consists of 93.10% K-39 and 6.90% K-41. K-39 has an atomic mass of 38.963707…

A:

Q: Consider a sample of antimony collected from a different solar system. The sample contained 45.8…

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Q: What is the atomic mass unit? a mass of a carbon atom b mass of a hydrogen molecule c (1/18) of…

A: What is the atomic mass unit?

Q: Potassium naturally consists of 93.10% K-39 and 6.90% K-41. K-39 has an atomic mass of 38.963707…

A:

Q: This homework is going to center around a completely made up element Maplenium. This metal has a…

A: Given data,Density of Ml=31.284lbs/dm3Mass of Ml=8.22×10-2Kg=0.18122lbsDimensions of…

Q: From the results of his gold foil experiment, Rutherford concluded that   Group of answer choices A.…

A: From the results of his gold foil experiment, Rutherford concluded that atoms are composed of a…

Q: A hypothetical element, X, has two isotopes: 47X with an isotopic mass of 47.621 amu and 51X with an…

A: The atomic mass of the element can be calculated as,

Q: 2. How would you describe the nucleus of an atom? A. dense, positively charged B. large, positively…

A: To describe : Nucleus of an atom.

Q: The atomic theory states that all matter is made of atoms. These atoms are made of subatomic…

A: Matter is made up of atoms.  Atom contains particles like electron, proton and neutron. Proton and…

Q: Rutherford's gold foil experiment determined that A) neutrons are in the nucleus. B) electrons have…

A: Rutherford bombarded the alpha particles on the very small sheet of gold. He observed that most of…

Q: Was Democritus’s proposal of the existence of atoms based on scientific methods or ideas? Explain

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Q: An element of unknown atomic mass has only two naturally occurring isotopes: 69X (68.935 amu,…

A:

Q: The element chlorine has two naturally occurring isotopes. The isotopic masses and abundances of…

A: Recall the following expression to calculate average atomic mass of chlorine average atomic…

Q: Which pair of particles has the same number of electrons?

A: Total electrons in a cation = atomic number - total positive charge  Total electrons in an anion =…

Q: Naturally occurring sulfur consists of four isotopes: 32S (31.9721 amu, 95.04%); 33S (32.9715 amu,…

A: Answer is written and explained below:

Q: Distinguish between Democritus’s ideas and Dalton’s atomic theory.

A: Democritus's ideas and Dalton's atomic theory both describes the nature of matter in terms of atoms.…

Q: The atomic radius of a gold atom is 144 x10-12 m.  The volume of a gold atom can be calculated using…

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Q: J.J Thomson determined the charge-to-mass ratio of the electron to be 1.759*1011 coulombs/kg. The…

A: We have to determineethe charge on the electron, C, in coulombs. Given, e/m = 1.759*1011…

Q: An American penny is 97.5% zinc and 2.5% copper and hasa mass of 2.5 g. Use the approximation that a…

A: Given, An American penny is 97.5% zinc and 2.5% copper and has a mass of 2.5 g. Use the…

Q: The isotope carbon­11 does not occur in nature but has been made in the laboratory. This isotope is…

A: Given: The carbon isotope= C611

Q: The volume of a single lead atom is 2.24×1023 cm³. What is the volume of a lead atom in microliters?…

A: Here the volume of a single lead atom is given in cm3 and we have to convert it into microliters.…

Q: 32p is an isotope of phosphorus that is frequently used in Biology labs. It has a mass number of 32.…

A: The given isotope is 32P.  The mass number of 32P, A = 32  Atomic number of 32P, Z = 15

Q: Assume element X has 2 isotopes: X-125 and X-126. For every 100 atoms of X, 30 of them have a mass…

A: Average atomic mass =mass of isotope X fraction abudance of isotope +mass of isotope -2X fraction of…

Q: some chlorine atoms have an atomic mass of 37, while others have an atomic mass of 35. What is the…

A: The mass number of an atom is the sum of proton and neutrons present in that atom.  Mass number =…

Q: A certain ion X3+ contains 21 electrons and 29 neutrons Identify an ion? what is the mass number…

A: Ions are formed, when an atom gains or loses its electrons, so the ions do not have the equal number…

Q: d. A sample of potassium atoms is made up of 54% 39K and 46% 41K. Use this information to find the…

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Q: A chemist finds 30.82g of nitrogen will react with 17.60, 35.20 , 70.40, or 88.00g of oxygen to form…

A: The mass of oxygen per gram of nitrogen in each compound is calculated as,

Q: The volume of a single tantalum atom is 1.20×10-23 cm³. What is the volume of a tantalum atom in…

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