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HC-Unit 2: Atomic Theory (Part 1: The Nucleus) Flashcards | StudBud
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HC-Unit 2: Atomic Theory (Part 1: The Nucleus)
HC-Unit 2: Atomic Theory (Part 1: The Nucleus)
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1
Which substance is a pure compound?
Fruit cake
Milk
Gold
Water
2
What is the charge of the Cr ion that contains 21 electrons?
2+
3+
2-
3-
3
Which change is a chemical change?
Condensation of dew on a cold night
The smoothing of rocks by ocean waves.
A forest fire
None of these.
4
How many neutrons does the Fe-56 isotope contain?
56
26
30
112
5
Which statement is NOT a part of Dalton's Theory?
Elements are made of indestructible particles.
All atoms of a given element have the mass and other properties.
Atoms combine in simple whole-number ratios to form compounds.
Atoms are composed of protons, neutrons and electrons.
6
Which element is a row 4 noble gas?
Zr
Kr
Ne
Br
7
How many electrons does the predictable (most common) ion of fluorine contain?
10
9
1
4
8
Which element is a main-group metal with an even atomic number?
K
Se
Cr
Ca
9
An element has four isotopes. From the table, find the average atomic mass of the element.
206.5 amu
207.2 amu
206.2 amu
20,720 amu
10
Determine the number of protons, neutrons, and electrons in
32
S
2-
?
16 p+, 48 no, and 16 e-
16 p+, 16 no, and 18 e-
16 p+, 32 no, and 18 e-
32 p+, 16 no, and 2 e-
11
Which element is a halogen?
O
Ne
I
Ca
12
Which property of trinitrotoluene (TNT) is most likely a chemical property?
None of these.
Yellow color
Explosive
Melting point is 353 K
13
An ion composed of which of these particles would have a mass approximately 16 amu and a charge of (-2).
8 protons, 8 neutrons & 6 electrons
8 protons, 8 neutrons & 10 electrons
8 protons & 8 electrons
8 protons, 8 neutrons & 8 electrons
14
Which statement best summarizes the atomic model that emerged from Rutherford's Gold Foil Experiment?
Most of the atoms mass of the atom is evenly distrubuted throughout.
All of the particles that compose an atom have the same mass.
The atom is composed of a dense positive nucleus with a vast e- cloud.
The atom is a sphere of positive charge with negatively charged particles.
15
Which pair of elements has the most similar properties?
Sr and Ba
H and He
S and Ar
K and Se
