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Worksheetsquiz 2 . 3sec
Total questions: 20
Worksheet time: 10mins
What is wrong with the following electron configuration:
1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^10, 4s^2?
The 4s orbital is lower energy than the 3d orbital, so it fills first and therefore should be listed first.
The p orbital can only hold 4 electrons.
The highest energy orbital is always listed first.
Electron numbers should be written as subscripts, not superscripts.
What information is necessary for writing electron configurations?
All of the orbitals occupied by electrons, and the number of electrons in each.
The mass of the element.
The nuclear stability of the element.
The spin of the electrons.
What is the maximum number of electrons that can be found in a 5p cluster (or orbital) of a single atom?
ركز ي حبيبي
2
5
6
14
Which block is manganese (Mn) located in?
d-block
f-block
p-block
s-block
Element having electronic configuration
1s2,2s2,2p6,3s2,3p6,3d10,4s2,4p6,4d10,5s2,5p3
belongs to the group in the periodic table:
3rd A group
2nd A group
5th A group
7th A group
The electronic configuration of
Cr3+is:
[Ar]3d44s2
[Ar]3d34s0
[Ar]3d24s1
[Ar]3d54s1
Which of the following has the electronic configuration [Ar] 3d5?
Cr
Fe3+
Mn
V
Which element is represented by the following electronic configuration ?
Fluorine
Neon
Nitrogen
Oxygen
Determine the oxidation for the phosorprus atom: HPO42-.
+4
+5
+3
+2
The oxidation number of C in CO2 is :
+2
+1
+3
+4
What are the oxidation numbers of copper on the left and right hand sides of the following equation?
Cu + 2AgNO3 → 2Ag + Cu(NO3)2 ?
0 and +2
+1 and +2
+2 and +1
0 and +1
Which one of the following elements can only have one oxidation number ?
Hydrogen
Fluorine
Oxygen
Chromium
The sum of the oxidation numbers of all of the atoms in a neutral compound is 0. What is the oxidation number of sulfur in H2SO4?
+6
-6
-3
+3
What is the oxidation number of nitrogen in N2O4
+4
+2
-2
-3
When mercuric oxide is heated it breaks down to mercury and oxygen as follows:
HgO → Hg + O2
What is the oxidation number of mercury in mercuric oxide?
+2
-2
+1
-1
The alkaline earth metals (Be, Mg, Ca, Sr, Ba, and Ra) are always assigned an oxidation state of +2.
What is the oxidation number of sulfur in magnesium sulfide (MgS)?
-2
+2
+1
+4
True or false? All monatomic ions have an oxidation number of +1.
False
True
The modern periodic table is ordered on the basis of:
atomic mass
atomic number
atomic charge
atomic radius
Which of these things you will not find in the periodic table?
Atomic Number
Number of neutrons
Atomic Weight
Element Name and Symbol
Number of elements present in period 2 of the long form of periodic table.
2
8
18
32
