In the world of electronics and semi-conductors it is vitally important to use the correct weights of materials. To do that, the correct atomic weight must be determined to five significant figures. For silicon, there are three major isotopes:  What is the correct atomic weight of silicon to five significant figures?

Q: 107. Prepare a table like Table 4.2 for the four different isotopes of Sr that have the natural…

A: The given atomic masses and % abundance are: mass of isotope (amu) % abundance 83.9134 0.56…

Q: Almost all boron atoms are found in two forms: boron-10 and boron-11. Both isotopes behave alike…

A: Given, Boron atoms are found in two forms: boron-10 and boron-11 Average mass of B = 10.81 amu

Q: An imaginary element Xz consists of two isotopes having masses of 100.0amu and 102.0 amu. A sample…

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Q: the element silver has two naturally occurring isotopes. the mass of one isotope is 106.905 u and…

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Q: Naturally occurring chlorine (Cl) consists of two isotopes. One of the isotopes has a mass of 34.969…

A: Isotopes have same atomic number but different atomic mass or mass number. Atomic number is equal to…

Q: An element (A) has 5 isotopes. The masses (and abundances) of the isotopes 46A, 47A, 48A, 50A are…

A: Given:Average atomic mass = 47.87u.49A/50A = 3.361.

Q: There are two naturally occurring isotopes of chlorine. 35 Cl has a mass of 34.9689 u. 37 Cl has a…

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Q: Copper has two naturally occurring stable isotopes, 63Cu (isotopic mass = 62.9296 amu) and 65Cu…

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Q: Boron has two naturally occurring isotopes: ^10B has a mass of 10.01 amu and 11^B has a mass of…

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Q: The element antimony exists in nature as two isotopes: 121Sb has a mass of 120.9038 u and 123Sb has…

A: The average atomic mass of Sb = 121.76 u.Mass of 121Sb = 120.9038 u.Mass of 123Sb = 122.9042 u.Let…

Q: An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9 % abundant. The other…

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Q: Silicon has three naturally occurring isotopes (Si-28, Si-29, and Si-30). Masses and natural…

A: From the values given in the table we will first calculate the abundance if Si-30 as shown in the…

Q: Calculate the relative abudance of the two europium isotopes.

A: According to the question Eu-151 has mass 150.916 amu and Eu-153 has mass 152.9209.  The average…

Q: A sample of atoms has an average atomic mass of 188.2 amu. If this sample consists of two naturally…

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Q: Naturally occurring Europium (Eu) consists of two isotopes with a mass of 151amu and 153amu. If the…

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Q: You are given 1.0g samples of Iron, Silicon, and Lithium. Which of the three samples will contain…

A: Given: 1 g sample of Iron, silicon and lithium To find: Sample containing largest number of atoms…

Q: Q1* Rubidium has two naturally occurring isotopes, rubidium-85 (atomic mass=84.9118 amu;…

A: We have given the masses and isotopic abundance of three isotopes of rubidium. Isotopes of an…

Q: Thallium (Tl) has two naturally occurring isotopes: Tl-203 (29.52 % ; mass = 202.972 amu ), and…

A: Average Atomic Mass of an atom can be calculated by using following formula -   Average atomic mass=…

Q: A completely made up element called Krystogen has two naturally occurring isotopes. The atomic…

A: Weight average of any element can be obtained by adding the product of mass of each isotope and its…

Q: An unknown element X has the following isotopes: 1ºX (20.00% abundant, atomic mass = atomic mass =…

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Q: Thillium has two stable isotopes, T1 203 and T2 205.Knowing that the atomic weight of thillium is…

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Q: The average atomic mass of Y is 54.6 . one isotop has an atomic mass of 53 and the other isotop has…

A: •Given:- Average atomic mass of Y =54.6 Isotope 1 mass (m1)= 53 Assume isotope 1 abundance(x1) is…

Q: Copper has two naturally occurring isotopes, 63 Cu(62.9396amu)and 65 Cu(64.9278amu). If copper has…

A: %abundance of cu63= |63.546-64.9278|÷|64.9278-62.9396| So solve it  and  27% Cu63 Same for CU65= 73%…

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

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Q: Explain why the atomic mass listed on the periodic table is 126.9 amu for an atom of iodine and, for…

A: Isotopes are the compounds which have same atomic number but different mass number.

Q: Boron has two possible isotopes. Based on the average atomic mass on the Periodic Table (10.81 amu),…

A: Boron is an inorganic element with atomic no. 5. It exists in two different isotopes, .e. Boron-10…

Q: Average atomic masses listed by IUPAC are based on a study of experimental results. Bromine has two…

A: Given The atomic mass for given two isotope are 78.9183 amu and 80.9163 amu. The given values of…

Q: Natural gallium, which has an atomic weight of 69.7230 amu, consists of gallium-69 and gallium-71…

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Q: Element A has two isotopes. The first isotope is present 18.07% of the time and has a mass of…

A: Isotopes have same atomic number but different mass number .they have similar chemical properties…

Q: It is well known that the element magnesium has three naturally occurring isotopes. Mg-24 represents…

A: It is clearly indicates that the Mg-24 posses a natural abundance of 79% along with other isotopic…

Q: There are only two naturally occurring isotopes of Copper, 63 Cu and 65 Cu. Copper has an atomic…

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Q: In Star Trek, a (fake) element that often plays a role in the plot is dilithium (Dt), which has…

A: Since the % abundance is not given exactly, it is a variable, thus answer will be given in terms of…

Q: Potassium has three isotopes with masses 38.9367 amu, 39.9640 amu, and 40.9618 amu. The abundance of…

A: Abundance of other two isotopes can be calculated as:-

Q: A hypothetical element has 3 stable isotopes. The masses of the isotopes and percent abundance of…

A: The percentage abundance is the amount of isotope in nature. The higher the percentage abundance,…

Q: Calculate the atomic mass of silicon. The three silicon isotopes have atomic masses and relative…

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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: Calculate the atomic mass of the following element. Experimental analysis show three isotopes:…

A: Given isotopes are : Isotope Mass     % 1 42.315 88.990 2 43.320 3.0090 3 44.325 8.0010

Q: Bromine has two naturally occurring isotopes. One of them, bromine-79, has a mass of 78.918 amu and…

A: Given: There are two naturally occurring isotopes of bromine. Mass of isotope 1 i.e. bromine 79 =…

Q: calculate the atomic mass for Sb.

A: Average atomic mass is defined as the sum of the masses of its isotope each multiplied by its %…

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: There are two isotopes of Beryllium: Be-9 and Be-11. A chemist examines a sample of 250 Beryllium…

A: If A1 , X1 and A2 , X2 are atomic mass and percentage abundance of two isotopes of an element then…

Q: Antimony has many uses, including infrared devices and as part of an alloy in lead storage…

A: a) Notation for each isotope antimony 121 ---->   51Sb121   antimony 123 ---->   51Sb123

Q: what is the average atomic mass for a hypothetical element that has two isotopes with relative…

A: Given two isotopes with relative masses and % abundances as follows: 12.2 amu, 25%; and 13.3 amu,…

Q: Chlorine has two naturally occurring isotopes, ³⁵Cl (isotopicmass 34.9689 amu) and ³⁷Cl (isotopic…

A: Percent abundance tells about the abundance of each isotope in the atmosphere.

Q: There are four isotopes of strontium. They have mass number of 84, 86,87 and 33. The atomic mass of…

A: NOTE : Among the given mass numbers of 4 isotopes, the mass number of 4th isotope is written…

Q: The mole is defined as the amount of a substance containing the same number of particles as exactly…

A: An isotope is the chemical element that has same number of protons in the nucleus having same atomic…

Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.