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Chemistry
9th -
12thgrade
Atomic Number, Mass Number and Isotopes
32 questions
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- 1. Multiple ChoiceWhat is the atomic number?the number of protonsthe number of protons and neutronsthe number of neutronsthe number of protons and electrons
- 2. Multiple ChoiceWhat is the mass number defined as?the number of protonsthe number of protons and neutronsthe number of neutronsthe number of protons and electrons
- 3. Multiple ChoiceWhat is the atomic number of this atom?1347
- 4. Multiple Choice
What is the mass number of this atom?
1
3
4
7
- 5. Multiple Choice
What is the atomic number of Barium, Ba? (enlarge the periodic table)
20
38
56
88
- 6. Multiple Choice
How many protons are in a sodium atom, Na? (tap to enlarge the periodic table)
Sodium has 1 proton.
Sodium has 3 protons.
Sodium has 11 protons
- 7. Multiple Choice
Atoms of the same element which have a different number of neutrons are called _________________.
ions
isotopes
quarks
molecules
- 8. Multiple Choice
Which subatomic particle has a negative charge in the atom?
proton
neutron
electron
quark
- 9. Multiple Choice
How many neutrons does C-14 contain? (tap to enlarge the image)
6
7
14
8
- 10. Multiple Choice
How many neutrons does an atom of the isotope Neon-22 have? (tap to enlarge the image)
12
10
22
20
- 11. Multiple Choice
How many electrons are in an atom with an atomic number of 50?
5
8
50
2
- 12. Multiple Choice
ALL atoms of the same element have:
same number of proton
same number of nucleon
different number of neutron
different number of electron
- 13. 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
- 14. Multiple Choicewhich atom has 4 neutrons?Li-6Li-7Li-8they have the same # of neutrons
- 15. Multiple ChoiceWhat quantities vary between isotopes of an element?protons, electrons, and atomic massprotons, electrons, and atomic numberneutrons and electronsneutrons and atomic mass
- 16. Multiple ChoiceHow many neutrons in C-14?67148
- 17. Multiple ChoiceIf X is the symbol for an element, which of the following two symbols represent isotopes of the same element? I. 7735X II. 7733X III. 8137X IV. 8135 XI and IIIII and IVI and IVI and III
- 18. Multiple ChoiceHow many neutrons does the isotope below have? 89 36Kr533689125
- 19. 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
- 20. Multiple ChoiceWhat is the number of protons that the element in this image contain?1471518
- 21. Multiple ChoiceElements can have the same number of protons?TrueFalse
- 22. Multiple ChoiceWhich subatomic particles contribute the most to the mass of an atom?Protons, Neutrons, ElectronsProtons onlyProtons and ElectronsProtons and Neutrons
- 23. Multiple ChoiceThe number of protons is equal tothe atomic numberthe number of neutronsthe energy levelsthe periodic table groups
- 24. Fill in the Blank
If an atom has 12 neutrons and 11 protons, what is its atomic mass?
- 25. Multiple ChoiceHow many neutrons does the isotope of lithium have?8345
- 26. Multiple ChoiceHow many protons does this isotope of titanium have?48222670
- 27. Multiple ChoiceIn a correctly written symbol what would be located in the "A" position?number of neutronsatomic numbernumber of electronsmass number
- 28. Multiple ChoiceAn isotope has three forms. 30% have a mass of 4 amu, 20% have a mass of 5 amu and 50% have a mass of 3 amu. Average atomic mass will be closest to2 amu3 amu4 amu5 amu
- 29. Multiple ChoiceCalculate the average atomic mass of silver.106.38649amu111.91896amu107.8677amu121
- 30. Multiple ChoiceAn element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?9.012, Beryllium12.011, Carbon6.941, Lithium10.812, Boron
- 31. Multiple ChoiceCompute the average atomic mass for silicon:27.97728.0928.976The average mass cannot be determined from provided information.
- 32. Multiple ChoiceOxygen has 8 protons. What is oxygen's atomic number?16815.9990
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