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Atoms Isotopes Average Atomic Mass
Development of Atom
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Atoms – 10 Points
QUESTION:
•What are the three subatomic particles that make up the atom?
ANSWER:
•Protons, Neutrons, Electrons
Atoms – 20 Points
QUESTION:
•What is calculated by adding the number of protons and the number of neutrons of an element?
ANSWER:
•Mass Number
Atoms – 30 Points
QUESTION:•“Mass is neither created nor destroyed” is what law and who discovered it?
ANSWER:•Law of Conservation of Mass by Antoine Lavoisier
Atoms – 40 Points
QUESTION:
•How many electrons can the third energy level hold?
ANSWER:
•18
Atoms – 50 Points
QUESTION:
•What is the Law of Definite Composition?
ANSWER:
•The law that a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound.
Isotopes – 10 Points
QUESTION:
•What causes the difference in the masses of isotopes?
ANSWER:
•The Neutrons
Isotopes – 20 Points
QUESTION:
•What is the mass number of an element that contains 41 protons and 44 neutrons?
ANSWER:
•85
Isotopes – 30 Points
QUESTION:
•10250Sn has how many protons?
ANSWER:
•50
Isotopes – 40 Points
QUESTION:
•What is the nuclear symbol for the isotope of oxygen which has 9 neutrons and 10 electrons?
ANSWER:
•178O2-
Isotopes – 50 Points
QUESTION:
•What are the three isotopes of Hydrogen?
ANSWER:
•Protium, dueterium, tritium
Average Atomic Mass – 10 Points
QUESTION:
•What is the average atomic mass of Carbon if 98.89% exists as 12C and 1.11% exists as 13C?
ANSWER:
•12.01 ~ 12 amu
Average Atomic Mass – 20 Points
QUESTION:•What is the average atomic mass of Boron if it exists as
19.90% 10B and 80.10% 11B?
ANSWER:
•10.801 ~ 11 amu
Average Atomic Mass – 30 Points
QUESTION:
•What is the average atomic mass of Calcium if 24% exists as 41Ca, 60% exists as 40Ca, and 16% exists as 39Ca?
ANSWER:
•40.1 ~ 40. amu
Average Atomic Mass – 40 Points
QUESTION:•Cadmium has five common isotopes: 110Cd (8.0%), 112Cd (7.8%), 113Cd (73.4%), 114Cd (5.5%), 115Cd (5.3%). What is the average atomic mass of cadmium?
ANSWER:
• 112.843 ~ 113 amu
Average Atomic Mass – 50 Points
QUESTION:
•Lithium has two isotopes with atomic masses of 6.674 amu and 7.254 amu. Estimate the abundance of these two isotopes if the atomic mass of naturally occurring lithium is 6.941.
ANSWER:•53.97%, 46.03%
Development of Atom – 10 Points
QUESTION:
•Who discovered the electron in 1897 by using a cathode ray tube?
ANSWER:
•J.J. Thomson
Development of Atom – 20 Points
QUESTION:
•Who determined the exact charge of an electron through the Oil Drop Experiment?
ANSWER:
•Robert Milikan
Development of Atom – 30 Points
QUESTION:
•Who discovered energy levels?
ANSWER:
•Niels Bohr
Development of Atom – 40 Points
QUESTION:
•Who discovered the neutron?
ANSWER:
•Chadwick
Development of Atom – 50 Points
QUESTION:
•Who realized there were positively charged particles moving in the direction opposite to cathode rays, which caused them to discover the proton?
ANSWER:
•Goldstein and Wein