?The definition of the atomic number is

Q: An element loses 22% of its mass every year, what is the half life?

A: Let the original mass of element be No and it loses 22% of mass its mass in a t=365 days i.e.,…

Q: In 1901, Wilhelm Röntgen was the first person to win the Nobel Prize for physics. For what discovery…

A: Wilhelm Röntgen, a German physicist have many precious research work on elasticity, capillary action…

Q: On the basis of rutherford model of an atom, wich subatomic particle is present in the nucleus of an…

A: On the basis of rutherford model of an atom, which subatomic particle is present in the nucleus of…

Q: One of the radioactive isotopes used in medical treatment or analysis is palladium-103. The…

A: Solution Given, half life of palladium(t1/2) = 17 days A0 = initial activity  At = activity at time…

Q: 40. Balance the following equation: 239- Th 90 239 U 239 94 2381 94 Pu 239 93

A: Given data:  N93239p → .....+ e-10 Required: Balance the equation

Q: The ratio of the stable Ar40 to K40 atom is found to be 10 in an old rock. All Argon atoms were…

A: Given that: Ar40K40=10Half life of K40, t1/2=1.25×109 years   (Available value)decay constant,…

Q: Define atomic number.

A: The atomic number of an element in periodic table  is the number of protons in the nucleus of an…

Q: Ionization energy is the energy needed to eject an electron from an atom. Compute the ionization…

A:

Q: What is the number of protons, neutrons, and electrons for element has; atomic number 9, mass number…

A: The given problem is based on atomic physic, To solve the given problem we will define the mass…

Q: When thorium decays by emitting a beta particle, what is the atomic number of the resulting nucleus?

A:

Q: At the beginning of an experiment, a scientist has 208 grams of radioactive goo. After 120 minutes,…

A: Given: Initial mass at t = 0, G(0) = 208 g After time t = 120 minutes, remaining mass, G(t) = 13 g…

Q: A 1-kg sample of a certain radioactive element is left to decay. The mass of that element is reduced…

A: The half-life of an element is calculated using the relation: N(t)=N012tt1/2…

Q: Isotope X has a half-life of 100 days. A sample is known to have contained about 1,500,000 atoms of…

A:

Q: Is the number of protons present inside the nucleus is equal to the number of electrons outside the…

A: Introduction :- The given statement is based upon the fact that whether an atom is charged or…

Q: If you start with 7.0×1010I7.0×1010I-131 atoms, how many are left after approximately 1 month?…

A: In this problem, the initial amount of I-131 atoms and half-life are given and we have to find the…

Q: Atom A has a larger atomic mass than atom B. Does this mean that atom A also has a larger atomic…

A:

Q: ng atoms, or isotopes, taking into In order to calculate the number of neutrons you must subtract…

A: The atomic number is the number of protons OR electrons. They are both equal thus making the atom…

Q: A nuclide of the element plutonium Pu-242. What is the number of neutrons in its nucleus

A: Given data: The nuclide of plutonium Pu-242 Required: The number of neutrons (N)

Q: What is a radioactive isotope

A: Required : What are radioactive isotopes.

Q: What characteristic of an atom is changing in nuclear reactions? nucleus of an atom O electron size…

A: There are two kinds of reactions, chemical reactions, and nuclear reactions. The given question is…

Q: What revolves about the positive nucleus in a definite orbit ? a. neutron o b. electron O C. proton…

A: Solution- According to Bohr's model in atomic physics the electrons travels in circular orbits…

Q: A radioactive species has 128 atoms present. If it has half-life of 5 years, calculate the number of…

A: Write the given values of this problem. N0=128 atomst=20 yearst12=5 years

Q: 3. A certain decaying radioactive substance is observed in a laboratory, and after 2 hours it is…

A: decay constant can be calculated from the expression of number of nuclei present after time t,…

Q: How many neutrons are in the nucleus of the atom 17 9 F

A: Given mass number is 17. Given atomic number is 9.

Q: As a staff scientist at a nuclear power plant, it is your job to understand radioactive substances…

A: Here we use law of radioactive decay to find the answer

Q: In his Nobel Prize address, Ernst Rutherford announced that he had experimental evidence that the…

A: An alpha particle is a radioactive particle that has an atomic number of 2 and a mass number of 4.…

Q: Explain the ionization of radiation in an atom.

A: When radiation incident on substance, electron eject from orbit of substance due to energy of…

Q: What is the half life of Technetium?

A: Introduction: The time that a radioactive isotope or a substance takes for half of the isotope to…

Q: In an elements square on the periodic table , the number with the greatest numerical value…

A: Atomic mass is denoted on the top of an element. atomic mass is greater than the atomic number…

Q: Why are radioactive isotopes usually not calculated in the average atomic mass?

A: Radioactive isotopes are the species with unstable nuclei. They release excess energy by…

Q: a-particles can be scattered by thin gold foil. The diagram shows the paths of three a-particles.…

A: The alpha particles are positively charged particles with atomic mass and mass number equivalent to…

Q: Solve using GUESS method. Atomic and Nuclear Phenomena 1. A hypothetical atom has three energy…

A: Let us set up the energy levels for the said atom. Let the energy levels in the oder of increasing…

Q: Another name for a negative beta particle is an electron.  True  False

A: Q Given that Negative beta particle  Let look at the negative beta decay process

Q: Write the appropriate symbol (with A, Z and the element symbol) for an yttrium isotope that has 39…

A:

Q: i. Explain using equation where necessary, the changes that take place in the atomic structure of…

A: i) Stage 1: emission of an alpha particle. The given element is radium as atomic number 88…

Q: Why does the atomic radius decrease as the electrons are added to a shell

A:

Q: Select statements that apply to the Rutherford model. Select one or more: a. The model suggested…

A:

Q: a Atom X and atom Y have the same mass number, but they have different atomic numbers. Are they…

A:

Q: Which of the following statements regarding the Rutherford model of the atom is correct? O The…

A: Rutherford model: On 1909, Sir Earnest Rutherford devised and performed an famous experiment called…

The Bohr model

Students often get confused between Rutherford’s model and Bohr model of an atom. They interpret the postulates of both these models to be the same, which is incorrect. Rutherford’s model differs from Bohr’s model in the following ways: