The last “missing” element from the first six periods waspromethium, which was finally discovered in 1947 amongthe fission products of uranium. Determine (a) the ratio ofthe number of neutrons in a 145Pm nucleus to the numberof protons, and (b) the number of electrons in a singlepromethium atom.

Q: Estimate the optimal number of neutrons for a nucleus containing 70 protons.

A: The neutrons and protons, the contents making the nucleus of an atom determine its stability.…

Q: Iodine-131 undergoes radioactive decay to form anisotope with 54 protons and 77 neutrons. What…

A: Iodine- 131 has atomic number(Z) of 53. Because in a neutral (uncharged) atom, number of…

Q: Determine the charge and made of nuclei in amu made up of the following: 6 protons and 6 neutrons…

A: 1) The nuclei is having 6 protons and 6 neutrons Since the charge of proton is +1 and charge on…

Q: What notations are commonly used to specify isotopes?What do each of the numbers in these symbols…

A: ANSWER

Q: Nuclei differ in their stability, and some are so unstable thatthey undergo radioactive decay. The…

A: Hey since you have posted a question with multiple sub-parts, we will solve first three sub-parts…

Q: For two isotopes Unk-45 and Unk-47 with relative abundance’s of 12.3% and 87.7%, respectively, which…

A:

Q: In _______, a negatively charged electron is ejected from the unstable nucleus, converting a neutron…

A: Stability of the nucleus is generally influenced by 3 factors- Mass Defect: greater mass defect,…

Q: Ernest Rutherford (the first New Zealander to be awarded the Nobel Prize in Chemistry) demonstrated…

A: I am solving only first three parts of the question as per the guidelines.

Q: A neutron and a proton combine to form a nucleus why does the mass. Of the nucleus differ from the…

A: Given: A neutron and a proton combine to form a nucleus. And the mass of the nucleus differ from the…

Q: Given the only naturally occurring isotope of aluminum is Al-27, determine its mass from the…

A: Isotopes of an element are the ones which have the same atomic number but different mass number.…

Q: How many protons, neutrons and electons are in 31P3-

A: The element  31P3- It is Phosphorus and having atomic number 15 and atomic mass 31.

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

A:

Q: Calculate the mass defect (in kg) of 203TI if it has an observed atomic mass of 202.9723 amu. The…

A: Observed atomic mass = 202.9723 amu  Mass of proton = 1.0078 amu  Mass of neutron = 1.0087 amu…

Q: Determine the number of protons and neutrons in uranium-235. Enter your answers numerically…

A: As we know that atomic number of the element equals the number of protons.  For uranium-235, Atomic…

Q: Write the nuclide notation, including charge if applicable, for atoms with the following…

A: (a)

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 mass number for an atom of barium containing 56 protons and 80 neutrons?

A: Atomic number = Number of protons  Mass number = Number of protons + number of neutron Given that:…

Q: During a nuclear decay a 238U atom can break apart into a helium-4 atom and one other atom. Assuming…

A: The property of a nucleus emitting α, β and γ rays is known as radioactivity and the substance…

Q: Tell the number of protons, neutrons, and electrons in the following isotopes. (a) 54Fe (b) 23Na…

A: Atomic Number = No. of Protons(P) = No of electrons(e)Mass number = No. of Protons + No. of…

Q: two protons and two neutrons are removed from the nucleus of an neon-20 atom, a nucleus of which…

A:

Q: Neon and magnesium each have three stable isotopes, whilesodium and aluminum each have only one.…

A: When the various atoms are formed from same element, the atomic number remains the same with…

Q: Fill in the blanks. Isotope 76AS3- has: Number of protons Number of neutrons Number of electrons…

A:

Q: The atomic masses of hydrogen-2 (deuterium), helium-4, and lithium-6 are 2.014102 amu, 4.002602 amu,…

A: Atomic masses hydrogen, H = 2.014102 amu

Q: What is the mass number for an atom of barium containing 56 protons and 79 neutrons?

A: Mass number of element is equal to  sum of number of proton to number of neutron.  Hence for a atom…

Q: For a beta (β) particle, give the number of protons:  neutrons: electrons:

A: Answer  Beta particle have -1 charge and same as the electron

Q: For the following isotopes that have missing information, fill in the missing information to…

A: Isotopes are variants of a particular chemical element which differ in neutron number, and…

Q: Write the nuclear symbols of the three isotopes of an element with an atomic number of 8 in which…

A: We have to write Atomic symbol for three isotopes of atomic number 8.

Q: If an atom of Uranium, Element 92, were to absorb an Alpha particle (comprising two protons and two…

A: For a balanced nuclear reaction sum of mass number and sum of atomic numbers must be same on both…

Q: "the atom with 38 protons and 49 neutrons"

A: Given,        Number of protons = 38         Number of neutrons = 49  Assume an atom is 'X'

Q: Write a complete nuclear symbol for a species that has 46 protons, 61 neutrons and 43 electrons:

A:

Q: 244Pu undergoes radioactive decay, emitting 4 alpha particles and 5 beta particles. What is the…

A: An alpha particle is equivalent to a Helium atom A beta particle is similar to an electron

Q: Write the symbolic notation of an isotope of an element having 8 protons, 8 electrons, and 11…

A: The symbolic notation of an isotope of an element having 8 protons, 8 electrons, and 11 neutrons

Q: What is the atomic mass of hafnium if, out of every 100 atoms, 5 have a mass of 176 amu, 19 have a…

A: The atomic mass of any element is given by the average mass of its naturally occurring isotopes.…

Q: The isotope of Nitrogen with a mass of 15amu is written as _? The isotope of Uranium with a mass of…

A:

Q: Which of the following is incorrectly matched? neutron : -1 atomic mass unit (amu) neutron : located…

A: A chemical element is made up of atoms, the smallest unit of ordinary matter. Atoms, whether neutral…

Q: 209Bi is the heaviest stable isotope of any element. How many protons and neutrons are present in…

A: The given data contains atomic mass of Bismuth is 209.

Q: In ______, an _ particle (identical to a helium nucleus of two protons and two neutrons) is ejected…

A: A radioactive decay in which alpha particle decays into another nuclei with a mass number reduced by…

Q: Nuclei with the same number of neutrons but different mass numbers are called isotones. Write the…

A: Nuclei with the same number of neutrons but different mass numbers are called isotones. Mass number…

Q: The correct way to write the isotopes 2Na, AI, Kr, 19r in hyphenated form is sodium-24, aluminum-29,…

A: The correct answer about hyphen notations are given below

Q: Silicon (14Si) has three stable isotopes with consecutive mass numbers. Write the complete nuclear…

A: Three Isotope are stable of silicon

Q: 203.) The naturally occurring isotope rubidium-87 decays by beta emission to strontium-87. This…

A:

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: (1) The radioactive isotope iodine-131 is used in medical imaging as indicated on the table above.…

A: The table details the types of radioactive decays by different isotopes.

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.