GNUR 160 Test 1 Review (Chapters 1-3) Questions with Complete Solutions
Which subatomic particle: Has a positive charge Correct Answer-proton
Which subatomic particle: Has the smallest mass Correct Answer-electron
Which subatomic particle: Is found outside the nucleus Correct Answer-electron
Which subatomic particles: Has a negative charge Correct Answer-electron
Iodine-131 (131/53 I) is used for detection and treatment of thyroid disorders. Which is an isotope of iodine-131? (131/52) Te OR. (132/53) I?
Number on top MASS NUMBER: Protons + Neutrons Number on bottom ATOMIC NUMBER: Protons Correct Answer-Isotope means dif. number of neutrons or different MASS NUMBER (ONTOP), therefore the answer is (132/53 I) Which isotope reacts faster? Carbon-12 or Carbon-13 Correct Answer-
Carbon-12 (mass number 12 protons and neutrons)
Silicon, appears in nature as (28/14) Si *mass=27.98 amu (29/14) Si *mass=28.98 amu (30/14) Si *mass=29.97 With an atomic weight (average weight) of 28.09 amu Which isotope predominates? PREDOMINATION IS DEPENDENT UPON THE AVERAGE WEIGHT Correct Answer-(28/14) Si (because that one is closest to the average mass or ATOMIC WEIGHT overall of silicon
Which of the following would be the best conductor of electricity? Li, B, C, N, or F Correct Answer-Li - the only metal listed (best conductor of electricity and heat)
50.0g of lead (Pb) is how many moles? Correct Answer-0.241 mol Pb How many electrons can n=2 energy level hold? Correct Answer-8 (4 orbitals each holding 2e-)
For elements in the 2nd period, which electron energy level is being filled? Correct Answer-n=2 The 2nd period starts with lithium atomic #3 and goes to Neon with atomic #10. With first level n=1, 2 electrons would be taken up so 3-10 would be in n=2
For each atom, give the total number of e- and the number of valence electrons
Calcium (Ca) Argon (Ar) Silicon (Si) Radium (Ra) Correct Answer-Calcium - 20 total e-, 2 valence
Silicon - 14 total, 4 valence
Argon - 28 total, 8 valence
Radium - 88 total, 2 valence Why does the nucleus of an atom have a positive charge? Correct Answer-
a) A hydrogen atom has a diameter of 5.3x10^-11 m. Express this number in nanometers and picometers. b) Placed side-by-side, how many Hydrogen atoms would it take to equal a distance of 1 inch (1 inch=2.45 cm)? Correct Answer-
A tin atom has a diameter of 145 pm. If the nucleus of an atom is 100,000 times smaller than the atom, what is the diameter of the nucleus of a tin atom in picometers? Correct Answer-
What is the atomic symbol for each element?a. iron b. iodine c. helium d. hydrogen Correct Answer-
Give the name and atomic symbol for the four most abundant elements in the human body. Correct Answer-
Table 2.4 lists the RDA for some elements and the AI for others. Why? Correct Answer-
In NAS dietary tables the Dietary Reference Intakes for selenium is reported in micrograms per day, rather than the milligrams per day given
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