Determine the nuclear composition (number of protons and neutrons) of the following isotopes. (a) argon-40   protons   neutrons (b) copper-63   protons   neutrons (c) indium-115   protons   neutrons

Q: Silver is composed of two naturally occurring isotopes: Ag-107 (51.839%) and Ag-109. The ratio of…

A: First calculate the percent abundance of Ag-109.

Q: How many protons, neutrons, and electrons are in an atom of (a) 138Ba, (b) phosphorus-31?

A:

Q: What is isobars and isotopes?

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

Q: There are three isotopes of an element, X-28, X-29, and X-30, with relative abundances of 92.2297%,…

A: Given  molar mass of X1 = 28 with abundance 92.2297% molar mass of X2 = 29 with abundance 4.6832%…

Q: What fraction of the a particles in Rutherford’s gold foil experiment are scattered at large angles?…

A: Given , diameter of gold atom = 2.7 Å  diameter of the nucleus = 1010-4Å

Q: How much does 4.28 x 10 21 atoms of Nickel weigh?

A: We know that, one mole of any substance contains 6.022 × 1023 atoms. We can determine the weight by…

Q: A hypothetical element, E, has two stable isotopes. One isotope has a natural abundance of 66.909%…

A:

Q: Isotopes of the same element have different mass numbers? true or false

A: isotope are  two or more species of element  with the same atomic number and position in the…

Q: The two naturally occurring isotopes of boron, boron-10 and boron-11, have masses of10.0129370 u and…

A: Atoms that have the equal number of protons but distinct numbers of neutrons are termed as isotopes.…

Q: Uranium exists mainly as two isotopes in nature, possessing mass numbers 235 and 238. Write the full…

A: The atomic number of Uranium is 92. Hence number of protons in both isotopes = atomic number = 92

Q: An unknown element X has the following isotopes: 140X (89.00% abundant) and 142X(11.00% abundant).…

A: Since,         Average Atomic mass=Σass of Isotope×% of Isotope100

Q: Which symbol represents the atom having 28 protons and 34 neutrons in its nucleus?

A: Atomic number: The atomic number (represented by the letter Z) of an element is the number of…

Q: Natural carbon, which has an atomic weight of 12.011 amu, consists of carbon-12 and carbon-13…

A: Average mass of an element is defined as the atomic mass of the element calculated by multiplying…

Q: What is a proton ? what is a chemical?

A: A proton is a subatomic particle which is present in the nucleus of an atom along with the neutrons.…

Q: in chemistry class, a group of students dtermined the mass-t-charge ratio for an electron to be 5.64…

A: Given: mass to charge ratio = 5.64×1012 kg/C Charge of electron = 1.605×10-19 C   Note:There is typo…

Q: An unknown element X has the following isotopes: ⁵²X (90.00% abundant), ⁴⁹X (8.00% abundant), ⁵⁰X…

A: The approximate atomic mass of element x is calculated as,

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

A:

Q: Iodine has a mass number of 127 and 53 protons, how many neutrons does it have?

A:

Q: An unknown element X has the following isotopes: 126X (22.00% abundant), 128X (34.00% abundant),…

A: These are three isotopes of element X are given .Calculate the average atomic mass of X in…

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

A:

Q: The radioactive nuclide with the symbol 75Se is used to measure the shape of the pancreas. What is…

A: The atomic number of Se is 34 and the mass number of this radioactive nuclide of Se is 75. Atomic…

Q: There are two naturally occurring isotopes of B- boron. One has an atomic mass of 10.013 amu and a…

A:

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: An element has two naturally occurring isotopes. One has an abundance of 37.4% and an isotopic mass…

A: Two naturally occurring isotopes.i. Abundance of 37.4% and an isotopic mass of 184.953 amuii.…

Q: Which statement about subatomic particles are false? Protons and neutrons have charges of the same…

A: Proton, neutron and electrons are the subatomic particles present in an atom.

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: the isotope with 33 protons and 40 neutrons in its nucleus

A: Given : number of protons is 33. And number of neutrons = 40

Q: The water found on Earth is almost entirely made up of the 'H and 160 isotopes for a formula of H2O…

A: The element which contains the same number of protons and different number of neutron is known as…

Q: Matter is defined as ....... إجابتك Felite is إجابتك

A: 2. The term matter refers to anything that occupies space and has mass—in other words, the “stuff”…

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

A:

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

A:

Q: neutrons

A:

Q: Which of the following statement concerning the nucleus is NOT true? A) The density of a nucleus…

A: The nucleus is the positively charged center in an atom that contains protons and neutrons. The…

Q: An element has three stable isotopes with masses of 27.977 amu, 28.976 amu, and 29.973 amu. The…

A: The average atomic mass of an element is calculated by considering the atomic mass of each isotope…

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

A:

Q: How many protons are in 2.08 x 10-21 g of F?

A: Atomic weight of F = 19 Given is Mass of F= 2.08 x 10-21 g Number of moles= given mass/ molar mass…

Q: At some point in the future, nuclear chemists have synthesized two stable isotopes of bohrium.…

A: Since average mass of the element is given so we can easily calculate the fraction of each isotope…

Q: 19. Two particles X and Y have the following composition: X: 17 protons, 18 neutrons, 17 electrons…

A: The question is based on the concept of atomic structure. there are various subatomic particles like…

Q: Estimate the percentage of the total mass of a 58Ni atom that is due to (a) electrons, (b) protons,…

A: Ni-58 has 28 electrons, 28 protons and 30 neutrons in it

Q: Phosphorus-31 forms an ion expressed as 31P3-.  What is the required change in the number of…

A: Concept introduction: Atom is smallest indivisible particles. Atom has subatomic particles,…

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: A fictitious element only has two naturally occurring isotopes: X and Y. If isotope X has a mass of…

A:

Q: 6. What is the mass of 6.20 x 1025 atoms of sulfur?

A: We have 6.2*1025 atoms of sulphur , we have to calculate the mass of given atoms of sulphur.

Q: Determine the nuclear composition (number of protons and neutrons) of the following isotopes. (a)…

A: Here, we have to calculate the number of protons and neutrons of the following isotopes: (a)…

Q: There are two isotopes of an unknown element, X-19 and X-21. The abundance of X-19 is 10.93%. Now…

A:

Q: In a chemistry class, a group of students determined the mass-to-charge ratio for an electron to be…

A: The charge on the particle and the mass of the particle is used to identify the subatomic particles…

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: How many protons, electrons and neutrons does Cl1?

A: In the question, we have been given a halide ion and we need to calculate the number of electrons,…

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.