unit 2 practice questions atomic theory

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Unit 2 Practice Questions Atomic Theory. Questions 1-4 refer to the following: Proton Neutron Electron Isotope Ion Neutral charge; 1 amu Positive charge Negligible weight Negative charge; pairs with opposite spin. Questions 1-4 refer to the following: Atom Ion Neutron Proton - PowerPoint PPT Presentation


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Unit 2 Practice QuestionsAtomic TheoryQuestions 1-4 refer to the following:


Neutral charge; 1 amuPositive chargeNegligible weightNegative charge; pairs with opposite spin11Questions 1-4 refer to the following:


The smallest representative particle of heliumLoss or gain creates positively or negatively charged ion, respectivelyParticle responsible for positive nuclear chargeIsotopes of uranium always differ in their number of this particleTheir number in the nucleus determines an elements atomic number2Basic measurementsAECB2I

The periodic table does not report mass numbersII

A mass number can be assigned to one isotope of an element but not to an element in generalAddition of an electron to an atom creates a positively charged ionEvery electron carries a negative chargeBECAUSEBECAUSE3DensityT,FF,T3I

Ca is a neutral atomII

It has the same number of protons and electronsAn element (X) with an atomic number of 16 has 14 electrons in X-2

Two protons bind the two outermost electronsBECAUSEBECAUSE4DensityT,FF,T4I

Two isotopes of the same element have the same mass numberII

Isotopes have the same number of protonsAn atom of 12C contains 12 protonsThe identity of an element is determined by the number of protons in the nuclei of its atomsBECAUSEBECAUSE5DensityT,FF,T5I

The atomic number of a neutral atom that has a mass of 39 and has 19 electrons is 19II

The number of protons in a a neutral atom is equal to the number of electronsA large number of alpha particles were deflected in the Rutherford experimentAlpha particles that came close to the nucleus of the gold atoms were deflectedBECAUSEBECAUSE6DensityT,FF,T6I

The isotope Cl-37 has 17 protons, 17 neutrons, and 17 electronsII

The atomic mass of chlorine is 35.43 amuBECAUSE7DensityT,FF,T7Which of the following is not a conclusion Rutherford made from his experiment with alpha particles being shot at a thin sheet of gold foil?

An atom has a very small, compact nucleusAn atom is mainly empty spaceAn atoms mass is concentrated in the nucleusAn atom has a very dense nucleusAn atom has a negatively charged nucleus8DensityE8Which of the following statements is false regarding sub-atomic particles?

The proton has a positive one chargeThe neutron has no chargeThe electrons are found in regions of the atom called orbitalsThe electrons have a greater mass than the protonsProtons and neutrons are the nucleons of the atom9DensityE9The two main regions of an atom are the

Principal energy levels and energy sublevelsNucleus and kernelNucleus and energy levelsPlanetary electrons and energy levels10ConversionD10An atom of beryllium consists of 4 protons, 5 neutrons and 4 electrons. The mass number of this atom is

1398511ConversionD11A mysterious element has the following relative abundances: X-34 15%, X-35 20%, X-36 65%Which of the following is true?

The atomic mass of the element is closer to 34.1The atomic mass of the element is closer to 34.9The atomic mass of this element cannot be determined without knowing exactly what X isA mass spectrophotometer would not be helpful in determining the percentages of the isotopesThe atomic mass of this element is approximately 35.512ConversionD12Atoms of 235U and 238U differ in structure by three

ElectronsIsotopesNeutronsprotons13ConversionD13Which of the following pairs of compounds can be used to illustrate the Law of Multiple Proportions?

NO and NO2CH4 and CO2ZnO2 and ZnCl2NH3 and NH4ClH2O and HCl14ConversionD14Two different sodium atoms or ions may differ in all of the following ways EXCEPT

The number of electrons outside their nucleiThe overall charge they carryTheir mass numbersThe number of neutrons in their nucleiThe number of protons in their nuclei15ConversionD15Which of the following isotopes has the greatest number of neutrons?

35Cl31P40Ar41Ca14C16ConversionD16Which is inconsistent with the concept of an isotope?

Same atomic numberDifferent number of neutronsSame mass numberSame name of the elementSame number of protons17ConversionD17Two isotopes of the same element will always differ in

Mass number but never in atomic numberAtomic number but never in mass numberCharge outside but never inside their nucleiNuclear charge but never in overall chargeThe number of electrons outside their nuclei but never in the number of neutrons inside their nuclei18ConversionD18What is the number of protons and neutrons in an atom with mass number 89 and atomic number 39?

50 protons and 50 neutrons50 protons and 39 neutrons39 protons and 89 neutrons39 protons and 50 neutrons39 protons and 39 neutrons19ConversionD19Twenty-five percent of element X exists as 210X and seventy-five percent of it exists as 214X. What is the atomic weight of element X in amu?

8521121221321420ConversionD20Which of the following combinations represents an element with a net charge of +1 with a mass number of 75?

35 neutrons, 35 protons, 34 electrons40 neutrons, 40 protons, 39 electrons40 neutrons, 35 protons, 34 electrons37 neutrons, 38 protons, 39 electrons40 neutrons, 35 protons, 35 electrons21ConversionD21Of the following statements about the number of subatomic particles in an ion of 3216S-2, which are true?I. 16 protonsII. 14 neutronsIII. 18 electrons

II onlyIII onlyI and II onlyI and III onlyI, II and III22SubstanceB22Isotopes of an element are related because which of the following are the same in these isotopes?I. Atomic massII. Atomic numberIII. Arrangement of orbital electrons

I onlyII onlyI and II onlyII and III onlyI, II and III23SubstanceB23For the radioactive element 99Tc, what is the correct number of protons and neutrons?

43 protons and 56 neutrons43 protons and 99 neutrons56 protons and 43 neutrons56 protons and 99 neutronsCannot be determined24ConversionD24II. Nuclear

Questions 1-4 refer to the following:

Alpha particleBeta particleGamma radiationNeutronPositron

Has a negative chargeHas no mass and no chargeHas the greatest positive chargeIs very similar to an electron25SafetyAED25Questions 1-3 refer to the following:

Alpha decayBeta decayPositron emissionGamma decayElectron capture

Often accompanies other radioactive processesCauses an atom to reduce its atomic number by 2 and its mass number by 4Occurs when a neutron is converted into a proton in a nucleus26SafetyAED26I

12C is an isotope of 14CII

The nuclei of both atoms have the same number of neutronsAlpha particles are the heaviest type of radiation decayAlpha emission particles consist of 2 protons and 2 neutronsBECAUSEBECAUSE27DensityT,FF,T27I

Nuclear fusion on the sun converts hydrogen to helium with a release of energyII

Some mass is converted to energy in a solar fusionThe bullet usually used to initiate the fusion of 235U is a neutron

Capture of the neutron by the 235U nucleus causes an unstable condition that leads to its disintegrationBECAUSEBECAUSE28DensityT,FF,T28I

Radioactive elements can emit alpha particles, beta particles, and gamma raysII

Radioactive elements have extremely stable nucleiIf a radioactive sample with a half-life of 40 years decays for 80 years, 25% of the sample will remainOne half of 100% is 50%, and one half of 50% is 25%BECAUSEBECAUSE29DensityT,FF,T29In the artificial transmutation 94Be + X 63Li + 42He, the particle represented by the letter X is a(n)

Beta particlePositronDeuteronProtonAlpha particle30ConversionD30146C 147N + X

What is X?42He0+1e0-1e11H126CThis reaction is an example ofAlpha decayBeta decayFusionGamma decayPositron emission

31ConversionD3122686Rn 21884Po + 42He

The radioactive decay shown above is an example ofPositron emissionGamma ray emissionAlpha decayBeta decayIonization32ConversionD3213153I 13154Xe + 0-1e

The radioactive decay shown above is an example ofPositron emissionGamma ray emissionAlpha decayBeta decayIonization33ConversionD33Which equation is an example of an artificial transmutation?

238U 4He + 234Th27Al + 4He 30P + 10n14C 14N + 0-1e226Ra 4He + 222Rn9943Tc 9943Tc + g34ConversionD34Which nuclear equation below demonstrates beta decay?

238U X + 234Th1H + X 3H14N + X 17O + 1H234Pa X + 234UNone of the above demonstrates beta decay35ConversionD35Element 10220X is formed as a result of 3 alpha and 2 beta decays. Which of the following is the parent element?

9016A11424Z11428Q128J + 9012L36ConversionD36Radioactive emanations can be detected by using

A persons DNAA block of leadA Geiger counterAn x-ray machineGraphite and heavy water37ConversionD37Sodium-24, a radioactive isotope used medically in blood studies, decays by beta decay and has a half-life of 15.0 hours. What is the product of the radioactive decay of sodium-24?

F-20Ne-24Ne-23Na-23Mg-2438ConversionD38After 62.0 hours, 1.0 gram remained unchanged from a sample of potassium-42 (half life is 12.4 hours). What was the mas of potassium-42 in the original sample?

64 grams32 grams16 grams8 grams 4 grams39ConversionD39The emission of a beta particle results in a new element with the atomic number

Increased by 1Increased by 2Decreased by 1Decreased by 240ConversionD40The energy released by the detonation of an atomic bomb is NOT related to

Fission of the atoms nucleusFusion of the atoms nucleusA chain reactionThe release of many neutronsThe uncontrolled speed of many neutrons41ConversionD41As a nucleus of a particular isotope disintegrates, another nuclide is formed. This chan