m. 29Cu + on → 63, 64

Q: Madame Curie discovered gamma rays. O True O False

A: Gamma rays has no mass and no charge. These are the most energetic form of electromagnetic…

Q: The radioactive element carbon 14 has a 1/2 life of 5750 years a scientist determined that the bones…

A: let assume the initial concentration of C-14 as Co=100%

Q: Why are some atoms radioactive?

A: The radioactive nuclei are unstable and have an excess number of either protons or neutrons in the…

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: Describe a cathode-ray tube and how it operates.

A: A cathode ray tube (CRT) is a specialized vacuum tube in which images are produced when an electron…

Q: The particle given by the following notation 63 Cu2+ Contains protons, neutrons, and electrons…

A: Step 1:

Q: The radioactive element carbon 14 has a 1/2 life of 5750 years a scientist determined that the bones…

A: According to the question, the radioactive element C has half life of 5750 years.  Lost percentage…

Q: QUESTION 21 Atoms consist principally of what three fundamental particles? O Electrons protons and…

A: Earlier it was considered that the smallest unit of any element that contains all the properties of…

Q: Given the only naturally occurring isotope of arsenic is AsAs-75, determine its mass from the…

A: Isotopes are the elements which have same atomic number and but different mass numbers.  In other…

Q: Compare the doses from natural radioactivity with radiation. Natural radioactivity and its…

A: Natural radioactivity is a phenomenon that occurs when unstable atomic nuclei decay and emit…

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 Greek philosopher argued that matter is continuous in 350 B.C?

A: The Greek philosopher, who argued that matter is continuous in 350 B.C has to be stated.

Q: Which element does not belong with the other four? 20Ca 19K 34Se 79Au 40Zr A) Ca    B) K    C)Se…

A: Atomic number of given elements  1. Calcium  has atomic number 20. 2. Potassium has atomic number of…

Q: + 42 He

A:

Q: Fill in the blanks: Isotopes are atoms with the same ________ number but different ________ numbers

A: Atoms are small unit of matter combine to form molecule. Atomic number- It is the no. of protons an…

Q: Starting with SEVEN TONS of the ore of pitchblende, Pierre and Marie Curie isolated a few milligrams…

A: Polonium-218 is a radioactive element. It can undergo both alpha and beta decay. Alpha decay is a…

Q: Q1) Both 60Co and 137Cs emit gamma rays. Which source had the least energetic gamma ray? Justify…

A: When the decay of the radioactive nuclei from higher energy to the lower energy takes place then it…

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: Even though several elements have only one naturallyoccurring isotope and all atomic nuclei have…

A: The average mass of naturally formed isotopes is the atomic mass of the atom and the sum of number…

Q: Uranium – 237 undergoes beta emission. Circle the correct resultant nucleus:

A: A beta particle is denoted by: -1   0e

Q: p. 5726Fe + on →. + 'on → 5926FE q. r. 5726FE > + °1B

A: During nuclear reaction various types of elements and isotopes are formed due to absorption or…

Q: Radium-226 is radioactive and has a half life of 1600. years. What percentage of a sample would be…

A: This problem is based on Nuclear Chemistry which is a subtopic of Chemical Kinetics.Here,…

Q: write the electronic congratulations of calcium whose atomic number is 20 and mass number is 40.

A: Given,  calcium whose, atomic number is 20 and mass number is 40.

Q: The complete symbol of an atom with atomic number 20, mass number 42 is? Select one: до Са20 а. 42…

A: Atomic number 20 means the element have 20 proton and mass number 42 means total proton ans neutron…

Q: Which of the following particles will NOT undergo deflection in a magnetic field. A Alpha particles…

A: The particle having charge, deflected in the magnetic field, the positively charged particle…

Q: Explain how the cathode ray was discovered.

A: Cathode rays are the beam of electrons that are observed in vacuum tubes. They are also called…

Q: Gamma radiation has less mass than alpha or beta radiation. O True O False

A: Nuclear chemistry is branch of chemistry that deals with radioactivity, transformation of nuclei of…

Q: mass of electron

A: Electron is defined as the lightest stable subatomic particle known.

Q: What is a stable isotope of lithium? How many electrons does it have?

A:

Q: Krypton consists of several radioactive isotopes, some of which are listed in the following table.…

A:

Q: Above what atomic number are there no stable isotopes of any element? 20 89 83 92 40

A: Atomic number 92

Q: 241 95Am + He - b. 2Ra 226 He +

A:

Q: Determine the missing element -3516S----à -10e + ?

A: Balanced nuclear equation is the equation in which the sum of subscripts as well as sum of…

Q: How many neutrons are present in P-31 and S-32? Select one: A. 15 and 14 B. 16 and 15 C. 16 and 16…

A: Given that:  Atomic mass of P(phosphorus) = 31 Atomic mass of S(sulphur) = 32 We know, atomic number…

Q: A plot of pressure-volume isotherms for an ideal gas at two different temperatures is shown below.…

A: Answer: In chemical thermodynamics expansion work is always taken as negative and compression work…

Q: the numbers of protons, neutrons, and electrons in each of the following species: 208Pb,

A: We have been given two species (208Pb, 60Ni).We have been asked to calculate number of protons,…

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: * Question 31 If you add an additional neutron to an atom, what do you create? A an isotope an ion a…

A:

Q: From the list below, choose the atoms that ONLY have radioactive isotopes. Gold Curium Bismuth…

A: Radioactivity is the property of certain atoms to spontaneously emit particles and/or energy from…

Q: Which sub-atomic particles are part of the nucleus? Protons Lions Axons Electrons Neutrons

A: An atom contains three subatomic particles: Electron Proton Neutron Electrons are negatively…

Q: Why are electrons in a cathode-ray tube deflected by electric fields?

A: Given information,    The electrons in a cathode-ray tube deflected by electric fields

Q: What is difference between Atomic mass & Mass nиmber

A: Atomic mass and Mass number

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: A selection of the most prominent individuals mentioned in this topic is given below. Match Column A…

A: In one column , there is different names of Scientists.  On the other column, there is some of the…

Q: Which of the following statements about lead is accurate?  there is only one isotope of lead…

A: The relative amounts of one lead isotope to another often depends on where the lead ore was mined

Q: Henri Becquerel discovered that unstable atoms were giving off small particles/rays. What was coming…

A: Nuclear radiation The emission of elementary particles or energy resulting from the decay of atoms.…

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.