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- 1. Multiple ChoiceValue representing the number of protons in an elementAtomic MassMass NumberValence ElectronsAtomic Number
- 2. Multiple ChoiceWhich subatomic particles are found in the nucleus of an atom?Protons and ElectronsProtons and NeutronsNeutrons and ElectronsProtons, Neutrons and Electrons
- 3. Multiple ChoiceAtoms of the same element must always have the same number of _________electronsneutronsisotopesprotons
- 4. Multiple ChoiceThe mass number of an element that has18 protons, 18 electrons, and 19 neutrons is _____.12.5132537
- 5. Multiple Choice
What element is represented in this Bohr Model?CarbonHydrogenAluminumLithium - 6. Multiple ChoiceWho believed that electrons were scattered amongst positively charged material.JJ ThomsonErnest RutherfordJohn DaltonNiels Bohr
- 7. Multiple ChoiceDiscovered that the atom has a small, dense, positively charged nucleus.Ernest RutherfordHeisenbergDemocritusJJ Thomson
- 8. Multiple ChoiceThe following picture represents which atomic model?Niels BohrDemocritusSchrodinger & HeisenbergJJ Thomson
- 9. Multiple ChoiceWhich statement about electrons is true?Electrons circle the nucleus of the atomElectrons have a positive chargeElectrons have a mass of 1 amuElectrons exist in the nucleus of the atom
- 10. Multiple ChoiceWhat do these isotopes of carbon all have in common?neutrons & mass numberatomic number and neutronsatomic number and electronsprotons, atomic number, and mass number
- 11. Multiple ChoiceHow many protons does this isotope of titanium have?48222670
- 12. Multiple ChoiceWhat quantities vary between isotopes of an element?protons, electrons, and atomic massprotons, electrons, and atomic numberneutrons and electronsneutrons and atomic mass
- 13. Multiple ChoiceFour isotopes of lead include lead-204, lead-206, lead-207, and lead-208. The average atomic mass of lead is 207.2. Which isotope of lead is likely to be the most abundant.204206207208
- 14. Multiple Choice
The atomic mass of an element is the ___.
average of the mass number and the atomic number for the element
weighted average of the masses of the isotopes of the element
total mass of the isotopes of the element
total number of subatomic particles in the nucleus
- 15. Multiple Choice
Magnesium exists as the three isotopes shown. What is the average atomic mass of magnesium?
20.74 amu
22.56 amu
18.39 amu
24.31
- 16. Multiple Choice24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?74.92 amu24.97 amu75.01 amu74.51 amu - 17. Multiple ChoiceHow many electrons does a Copper atom have?63299234
- 18. Multiple ChoiceMost of an atom's mass is found in theelectrons.nucleus.
- 19. Multiple ChoiceCations are...PositiveNegativeNeutralPurring
- 20. Multiple ChoiceWhat is a Rubidium ion's symbol?Rb-Rb+Rb-2Rb+2
- 21. Multiple ChoiceAn atom becomes _________ when it gains electrons.PositiveNegativeNeutralInvinsible
- 22. Multiple Choice
What determines if an element is reactive or not?
number of protons
number of valence electrons
mass number
number of core electrons
- 23. Multiple Choice
What group on the periodic table is stable?
Group 1
Group 2
Group 7
Group 8
- 24. Multiple Choice
How do metals achieve stability?
losing electrons
adding electrons
losing protons
adding protons
- 25. Multiple Choice
How do nonmetals achieve stability?
losing electrons
adding electrons
losing protons
adding protons
- Answer choicesTagsAnswer choicesTags