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The Periodic Table, Periodicity, and Trends Flashcards | StudBud
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The Periodic Table, Periodicity, and Trends
The Periodic Table, Periodicity, and Trends
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#chemistry #mendeleev #periodictable #periodicity #metals #nonmetals #halogens #noblegases
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Answers
1
Density is the mass over volume of a substance (d=m/v). A correct unit for density would be:
g/mg
mL/g
Kg/L
mm/s
2
How many valence electrons does Fr have?
3
7
1
2
3
Electrons in the outer energy shell (orbital) used for chemical reactions:
valence electrons
transition electrons
ground electrons
displacement electrons
4
What does oxidizing mean?
A chemical reaction where one of the reactants is oxygen
A chemical reaction where one of the products is oxygen
Having a tendency to strip electrons from other elements
Highly reactive to form a compound with oxygen
5
How many valence electrons does Mg have?
7
3
1
2
6
What is the valency of O (oxygen) (Careful, not number of valence electrons)?
7
2
3
1
7
Which of these elements is a noble gas?
Ne
Na
Cl
Te
8
What's the name of the scientist who proposed a predictable periodicity of the elements?
JJ Thomson
Erwin Schrodinger
Niels Bohr
Dmitri Mendeleev
9
Which of these elements is a halogen?
I
Mg
Hg
Si
10
When his predictions did not match actual observations, Mendeleev:
Left blanks in periodic table for elements to be discovered
Moved elements accordingly so no blank spaces would be left
Adjusted the weight of elements to fit his periodic table
Nothing, his predictions matched all actual observations
11
Which of these is a liquid at room temperature?
Mercury (Hg)
Bromine (Br)
Chlorine (Cl)
Tungsten (W)
12
Is hydrogen a metal or nonmetal?
Nonmetal
Metal
13
Which of these elements would you expect to find as a diatomic molecule?
I
Cu
Na
Zn
14
What does the Periodic Law state?
The periodic nature of carbon makes it form many compounds
Halogen elements will periodically react with metals
Transition metals change from metal to nonmetal periodically
Properties of elements recur when arranged by atomic weight
15
Which orbital would you fill first with the electrons, 2s or 3p?
3p
2s
16
Which of these elements is an alkali metal?
Ti
Cl
Be
K
17
Principle that states electron orbitals must be filled from the lowest to highest energy level:
Hund's principle
Pauli exclusion principle
Aufbau principle
18
The transuranium elements, (i.e. the elements with atomic number greater than 92) are all:
Man-made in laboratories
Predicted by Mendeleev in his first periodic table
Good conductors of electricty
Lanthanide elements
19
A diatomic molecule is:
a molecule that has gone from a liquid to a gaseous state
molecules composed of two atoms (same or different elements)
a molecule in its most simple formula
moles composed of one atoms (same or different elements)
20
Which of these elements is not a metal?
C
Zn
Nb
Na
21
Which of these orbitals does not exist?
1p
1s
3d
4p
22
Principle that states a maximum of two electrons, based on spin, can exist in a given orbital:
Aufbau principle
Pauli exclusion principle
Hund's principle
23
What are valence electrons?
The electrons that are in the first energy 1s orbital
The electrons that have been lost by an element (ion)
The electrons in the outermost energy level
The electrons for which we don't know their exact location
24
Which of these is a gas at room temperature?
Cr
N
Y
Ga
