1. (a) What isotope is used as the standard in establishing the atomic mass scale? (b) The atomic weight of chlorine is reported as 35.5, yet no atom of chlorine has the mass of 35.5 amu. Explain.

Q: An atom of calcium is represented by 12C.. How many neutrons are in the nucleus of this atom?…

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Q: In a far away universe, there exist an element called Macandcheesium (Mc). This element has 61…

A: The average atomic mass of an element is calculated as the average of all the isotopic masses of the…

Q: The mass of 6 million molecules of a diatomic gas is 5.1  × 10-19 kg. What is the atomic mass of the…

A: Mole concept: The number of molecules or atoms present in the one mole of the substance is equal to…

Q: Only two isotopes of boron (B) occur in nature; theiratomic masses and abundances are given in the…

A: Concept introduction: Isotope is defined as atoms of same element with same atomic number but…

Q: Write the isotopic symbols in the form X-A (for example, C- 13) for the iodine isotope with 74…

A: Write the isotope for iodine with 74 neutrons

Q: What is isobars and isotopes?

A: Isobars: 1. Isobars are elements with different atomic numbers and the same mass number. 2. Isobars…

Q: A sample of an element has three isotopes: X with a mass of 18.321 amu and percent abundance of…

A: The average atomic mass of an element that has three isotopes is the fractional abundance of X times…

Q: Write the isotopic symbols in the form X-A (for example, C- 13) for the argon isotope with 22…

A: When the two Two has same no of proton but mass no is different then they are called is isotope of…

Q: What element is found in period 4, group 4A? Use the atomic symbol to identify the element.

A: Given : Period of element is 4  Group of element is 4 A.

Q: Describe the general structure of an atom and its isotopes.

A: Atom is the basic unit of matter it consists of a heavy positive mass at its center called the…

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

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Q: Which isotope has the same number of electrons and neutrons as the anion 19F-?

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Q: 2-81. (*) A 40.0-milligrams sample of the compound X.O, contains 22.5 milligrams of oxygen atoms.…

A: We have a 40 mg of sample  of X4O10, which contain 22.5 mg of oxygen atoms,  We have to calculate…

Q: What is the mass number (A) of a calcium isotope that has 19 neutrons?

A: Answer :-  The mass number (A) of a Calcium isotope that has 19 neutrons = 39…

Q: Which pair of atoms constitutes a pair of isotopes of the same element? 29. 14 28 58 B) X 26 A) X…

A: Isotopes are defined as the elements having same atomic number but different mass number.  X1328…

Q: Write isotopic symbols in the form X–A (e.g., C-13) for eachisotope.a. the silver isotope with 60…

A: The sum of atomic number and neutrons gives the atomic mass of an element. It is given by the…

Q: The amount of carbon-14 in ancient artifacts and fossils is oftenused to establish their age.…

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Q: An unknown element X has the following isotopes: ²⁵X (80.50% abundant, mass = 25.03 amu) and ²⁷X…

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Q: If the reference for atomic masses of the elements were changed to 12C = 10.00 the relative atomic…

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Q: 1. Within the context of the atomic nucleus, what do the words stable and unstable mean?         2.…

A: Since you have posted multiple questions, the answer for first question is given below. Kindly…

Q: Suppose that a hypothetical element con- sists of a mixture of two isotopes. One iso- tope, having…

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Q: Bromine has only two natural isotopes, and they occur in about equal abundance.   If 79Br79Br is…

A: Average atomic mass of an element is obtained by the sum of the product of isotopic mass and natural…

Q: What are the factors that affect the average atomic mass of a mixture of isotopes?

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Q: An element consists of 4.35% of an isotope with mass 49.946 u, 83.79% of an isotope with mass…

A: Average atomic mass: The average atomic mass of an element is the sum of the masses of its isotopes,…

Q: a) Which two of the following are isotopes of the same element:3116X, 3115X, 3216X? (b) What is the…

A: Two or more elements with identical atomic number but with different atomic mass are called…

Q: Gallium has two naturally occurring isotopes. One of them, gallium-69, has a mass of 68.925581 u and…

A: Gallium has two naturally occurring isotopes. Mass of Gallium-69  = 68.925581 u Percent Isotopic…

Q: Rubidium has two naturally occurring isotopes, from the following data calculate the value of X?…

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Q: A positively charged particle in the nucleus of an atom is    A. an electron    B. a neutron…

A: A positively charged particle in the nucleus of an atom is given below

Q: - Argon has three naturally occurring isotopes: 0.337% 36Ar, 0.063% 38Ar, and 99.60% 4ºAr. Estimate…

A: Given : There are 3 naturally occurring isotopes of Argon i.e Ar.

Q: Write isotopic symbols in the form X-A (e.g., C-13) for each isotope.a. the silver isotope with 60…

A: The nuclear reactions are a type of chemical processes which lead to the formation of some new…

Q: You are exploring the universe in your spaceship, and you land on a planet that is very similar to…

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Q: In a far away universe, there exist an element called Macandcheesium (Mc). This element has 61…

A: An element existing away from universe, whose average atomic mass is to be determined.

Q: What is the symbol for the isotope of 55 Fe that possesses 31 neutrons?

A: In isotope 55Fe there are 26 protons because the atomic number of Fe is 26, and the number of…

Q: Sort the characteristic properties of the following isotopes of nitrogen into their respective bins.

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Q: Which of the following statements is false? a. The proton and neutron are primarily responsible for…

A: we have to select the false statement

Q: Write a symbol of an unknown or hypothetical element, then put on the proper place its atomic number…

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Q: Thallium has two stable isotopes, 203TIand 205TI. Knowing that the atomic weight of thallium is…

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Q: Deducing Relative Abundance by Semi-Quantitative Reasoning- Without Doing Math How would I go about…

A: More number of neutrons are required for higher atomic number elements to avoid repulsion.

Q: a) How many protons, electrons, and neutrons are in an 266 Sg atom? (atomic mass = 266) b) Atoms…

A: Elements are the species which consist of only one kind of atoms. In other words, species which…

Q: Element X has two naturally occurring isotopes, 20X with a mass of 19.99 amu and 22X with a mass of…

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Q: A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar…

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Q: One of the heaviest atoms found in nature is 238U. Its relativeatomic mass is 238.0508 on a scale in…

A: Given, 238U relative atomic mass is 238.0508

Q: (a) Which two of the following are isotopes of the same element:3116X, 3115X, 3216X? (b) What is the…

A: (a)  31 16X and 3216X are the isotopes of the same element .

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

A: The given statement is  Is the statement inconsistent with Rutherford’s nuclear theory as it was…

Q: potassium has three stable isotopes k-39, k-40 and k-41 but k-40 has a very low natural abundance.…

A: K  has 26 number of possible isotopes from 31K to 57K but among them only three are stable isotopes…

Q: Chemistry of Mars NASA's 1997 mission to Mars included a small robot, the Sojourner, that analyzed…

A: Given : There are 3 naturally occurring isotopes of MgO. And the abundance data of isotopes are,

Q: Naturally occurring tungsten metal is composed of three stable isotopes: 182 74W, with a natural…

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Atomic Structure

The basic structure of an atom is defined as the component-level of atomic structure of an atom. Precisely speaking an atom consists of three major subatomic particles which are protons, neutrons, and electrons. Many theories have been stated for explaining the structure of an atom.

Shape of the D Orbital

Shapes of orbitals are an approximate representation of boundaries in space for finding electrons occupied in that respective orbital. D orbitals are known to have a clover leaf shape or dumbbell inside where electrons can be found.