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- 1. Multiple ChoiceThe mass number of an element that has 18 protons, 18 electrons, and 19 neutrons is _____.12.5132537
- 2. Multiple ChoiceThe atomic number of an element that has 9 protons, 9 electrons, and 10 neutrons is _____.9101928
- 3. Multiple ChoiceIf the number of electrons in an atom changes you make a(n) __________________.ionisotopenew elementisomer
- 4. Multiple ChoiceHow many neutrons does uranium-239 have92147239331
- 5. Multiple ChoiceWhich statement about subatomic particles is true?Protons, neutrons, and electrons all have about the same mass.Unlike protons or neutrons, electrons have no mass.Neutrons have no charge and no mass.An electron has far less mass than either a proton or neutron.
- 6. Multiple ChoiceWhich of the following is unique for any given element?the number of neutronsthe charge on the electronsthe number of protonsthe mass of a neutron
- 7. Multiple ChoiceWhich statement is true about oxygen-17 and oxygen-18?They do not have the same number of protons.Their atoms have an identical mass.They are isotopes of oxygen.The have the same mass number.
- 8. Multiple ChoiceThe mass number of a single atom isthe sum of the protons and neutrons in the atom.twice the number of protons in one atom of the element.a ratio based on the mass of a carbon-12 atom.a weighted average of the masses of the element’s isotopes.
- 9. Multiple ChoiceThe dense center region of an atomelectron cloudcorenucleuscentrino
- 10. Multiple ChoiceAn atom has 10 protons and a mass number of 18. It has __ neutrons1018288
- 11. Multiple ChoiceHow many protons are present in phosphorus-31?15163146
- 12. Multiple ChoiceTwo isotopes of carbon are carbon-12 and carbon-14. These isotopes differ from one another by two protons.truefalse
- 13. Multiple Choice
Changing the number of neutrons in an atom changes its...element type.mass.charge.atom type. - 14. Multiple ChoiceWhen there are the same number of protons and electrons in an atom, that atom is a...positive ion.negative ion.unstable isotope.neutral atom.
- 15. Multiple ChoiceWhat is different about isotopes of the same element?# of protons# of electrons# of neutrons
- 16. Multiple ChoiceWhat subatomic particles are found in the nucleus of an atom?neutron and electron.neutron and proton.proton and electron.
- 17. Multiple ChoiceWhich subatomic particle is found outside of the nucleus?ElectronProtonNeutronQuark
- 18. Multiple ChoiceProtons have a ______ charge.postivenegativeneutralpostive and negative
- 19. Multiple ChoiceWhat is the charge of an atom that has lost one electron?1-2-1+2+
- 20. Multiple ChoiceWhat is the charge of an atom that has gained one electron?1-2-1+2+
- 21. Multiple ChoiceWhich of the following is a negatively charged subatomic particle?ElectronProtonNeutronQuark
- 22. Multiple ChoiceParticles in an atom that are neutral and have no charge are ______.NegatronsElectronsNeutronsProtons
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