One atom of Se-77 is 6.410 times as heavy as an atom of C-12. What is the atomic mass of Se-77?

Q: Isotopes are defined as atoms ofa. the same element with different numbers of protons.b. radioactive…

A: Atoms of the same element have the same number of protons, which is also called the atomic number.

Q: Which of the following represents isotopes?   O (mass number 18) and O (mass number 18) O (mass…

A: Isotopes are the chemical element having same atomic number but different atomic masses.  Isobars…

Q: Stuck on this question

A: Isotopes are defined as the elements with same atomic number but different mass number. For Eg…

Q: How many protons, neutrons and electrons are in one atom of 70/30Zn?

A: We have given that  atom   3070Zn   We know that Representation of an element                Z AX…

Q: Calculate the average atomic mass of uranium given its naturally occurring isotopes and their…

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Q: A fictional element Ho has two stable isotopes and an average atomic mass of 18.357 amu. Use the…

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Q: What is the atomic mass of oxygen-17 (16.9991 amu) at 0.038%

A: Using the formula We can easily get the answer

Q: Where are elements heavier than helium created?

A:

Q: How many protons and neutrons are present in an atom of 45/21A5Sc

A: The above is isotope of Scandium.

Q: The radioactive element francium undergoes a series of nuclear decays, eventually forming a stable…

A: Alpha DecayXZA - H24e  → YZ-2A-4          ↓         ∝Beta decaye.g C614   - e-10    → N714

Q: How to calculate the relative atomic mass (6.015122) of 6Li, from the atomic mass of Lithium?

A: In the given question we have to calculate the relative atomic mass of Lithium.  we know that,…

Q: stable isotopes, with low atomic numbers, have a N/Z ratio of 1. What does that imply

A: N/Z ratio - It is the ratio of the number of neutrons to the number of protons of the nucleus of an…

Q: If an isotope has 90 protons, how many neutrons are required in order for it to have a stable atomic…

A: Concept-: Isotope: Isotopes are known as members of a family of an element which all have the same…

Q: What is the number of neutrons in I-131?

A: Given, Element : I-131 Number of neutrons = ? Note: In the modern periodic table, iodine (I) belongs…

Q: Which isotopes would you expect to be stable? 208 pb 234Pa uranium-235 oxygen-16 He

A: The isotopes which are expected to be stable are given below

Q: What is the atomic mass of oxygen-16 (15.9949 Amy) at 99.757%

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Q: 9. Which isotope is used in many smoke detectors for homes and businesses to measure levels of toxic…

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Q: Gamma-ray photons have: O no mass and an electric charge of +1 no mass and an electric charge of -1…

A: Gamma rays (γ) are photons.

Q: For the Isotope 8538SrA. What is the atomic number?B. What is the mass number?C. What is the number…

A: a) for 8538Sr  Atomic number = 38  as atomic number is always written in lower left of the element…

Q: What is the mass number of xenon-127?

A:

Q: Question attached

A: The given isotope is C-15, which means that it has 9 neutrons. All carbon isotopes have the same…

Q: What is the atomic mass of boron-12? A. 13.00335 amu B. 4.00260 amu C. 18.99840 amu D. --…

A: Since boron has atomic number = 5  Hence number of electrons in boron = 5 and to become neutral atom…

Q: What is the charge of the nucleus of element 89?

A: The number of protons corresponds to the charge of the nucleus since Neutrons have no net charge, it…

Q: An element has an atomic number of 41 and a mass number of 81. Using your determination as to…

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Q: What is B-10's atomic weight?

A: The Boron is an element which is a metal and it consists of two isotopes B-10 and B-11. The stable…

Q: number of protons number of neutrons 6ONI number of electrons number of nucleons

A: 60Ni is isotope of Nickel. 60Ni isotope is used for neutrons studies of amorphous metal structures.…

Q: What is the mass number of zinc-68?

A: The Answer to the the following question is given as:

Q: Silver has an atomic mass of 107.868 amu. The Ag-109 isotope (108.905 amu) is 48.16%. What is the…

A: Isotopes are the elements with different atomic mass (mass number) and same atomic number. Here…

Q: Using atomic notation, indicate the isotope having 26 pt, 32 nº, and 26 e-.

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Q: In the notation 289 115 Mc, the number 289 is the 3 number of electrons atomic number atomic mass…

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Q: Consider two isotopes Fe-54 and Fe-56, write the nuclear symbol for both isotope. How do they differ…

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Q: What element is defined by the following information?    p+=20  n ^o=20   e^-= 20

A:

Q: 7. In cach pair of isotopes shown, indicate which one you would expect to be radioactive and why. a)…

A: Isotope is defined as same number of proton and electron but different number of neutron. For…

Q: what is the mass of br-79

A: Bromine is the third member of the halogen group in the periodic table. Bromine-79 is one of the two…

Q: Gold has one stable isotope, whichis gold-197, with an atomic mass of 196.97amu. A 14k (14-karat)…

A: Given:   Mass of 14k gold =  5.00-g  Gold percentage  = 58.3%  Other metals        = 41.7% To find:…

Q: Atoms X, Y, Z, and R have the following nuclear compositions: 412 R 410 Y 183 412 Z 186 410 X 186…

A: Isotopes of any element have same atomic number but different atomic mass. i.e. isotopes of any…

Q: The atomic mass of rhenium is 186.2. Given that 37.1% of natural rhenium is rhenium-185, what is the…

A: Average atomic mass = ∑i=1n (mass of ith isotope)(% abundance of ith isotope)100 Where "n"…

Q: Isotope 25Mg2+ has: Number of protons Number of neutrons Number of electrons Mass number

A: Given :-  25Mg2+  To calculate :-  number of protons  number of neutrons  number of electrons  mass…

Q: Potassium (Z = 19) has three primary isotopes: K-39, K-40, and K-41. 1) The half-li fe of K-40 is…

A: Given: Half life of K-40 = 1.248 X 109 years Initial activity of K-40 = 820 Ci And final activity of…

Q: 55.75g Al + 215,5g Oxygen , what mass is formed

A: Answer= 105.31 g

Q: An element has two naturally occurring isotopes. One has an abundance of 51.839% and an isotopic…

A:

Q: 130TE2 number of protons number of neutrons number of electrons number of nucleons

A: The symbol of the element Tellurium represented as130Te522- In the above symbol 52 is the atomic…

Q: The average atomic mass of Ga is 69.72. Naturally occurring Ga is composed of Ga-69, which has an…

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Q: Element X has two isotopes. The first isotope has a natural abundance of 80% and has a mass of 60…

A: Given : Abundance of first isotope = 80% Mass of first isotope = 60 amu Abundance of second isotope…

Q: Naturally occurring neon exists as three isotopes. 90.51% is Ne-20 with a mass of 19.99 amu, 0.27%…

A: Given: There are three naturally occurring isotope of Neon. Mass of isotope 1 = 19.99 amu. Abundance…

Q: A certain element consists of two stable isotopes. The first has a mass of 68.9 amu and a percent…

A:

Q: Find the number of electrons and neutrons in the following: 207Pb+2 Electrons Neutrons

A: Nucleus is consisting of protons and neutrons. Number of neutrons = Atomic mass - number of protons

Q: How many moles of carbon are there in a diamond weighing 2.11g

A: Mole is defined as a unit of measurement for the amount of substance in the International System of…

Q: Barium -142 would have how many neutrons in its nucleus

A:

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.