Given the electron configuration of an unknown element X as follows:
1 s2 2 s2 2 p6 3 s2 3 p6 4 s2 3 d10 4 p6 5 s2 4 d10 5 p6 6 s1 4 f14 5 d10
1. I. It is an alkali metal
II. It is malleable and ductile
III. It has the oxidation state of +1 in its complex ion [ XCl4 ]─
Which of the statements is/are correct?
a) I
b) II
c)III
d)I and II
e)I,II and III
2
2. How many electrons of the element X do fit to the condition: 𝑛 + 𝑙 2 ≤ 17 ; where
n=principal quantum number ; l= angular momentum quantum number of the electron
a) 24
b) 33
c) 27
d) 50
e) 36
3. How many electrons of the element X do fit to the condition: │𝑚𝑙 │ > 0 ; where
ml= magnetic quantum number of the electron
a)11
b) 42
c) 56
d) 68
e) 71
4. How many electrons of the element X do fit to the condition: 𝑚𝑙 − 𝑙 = −1 ; where
ml=magnetic quantum number ; l= angular momentum quantum number of the
electron
a) 16
b)14
c) 8
d) 6
e)0
For the questions from 5 to 11, write the correct answer next to the question(from
5 to 11
The following atoms are given: Cu, Te, Pt, Br, Al, O, At, C, Ga, Se, He, Ni, H, Cs, Pd,Hg
5. Which of them has the highest first ionization energy?
6. Which of them is the greatest atom?
7. Which of them may have positive electron affinity?
8. Which of them has both one valence electron and the O.S= -1 in its compounds
with metals?
9. Which of them is ferromagnetic?
10. Which of them may be used as a photo conductor?
11. Which of them may have the highest density ?
12. Which of the elements given below would you expect to have more than one
oxidation state(O.S) in its compounds with non-metals?
a) H
b) Al
c) Ar
d) Ba
e)Hg
Given the electron configuration of an unknown element X as follows:
1 s2 2 s2 2 p6 3 s2 3 p6 4 s2 3 d10 4 p6 5 s2 4 d10 5 p6 6 s2 4 f14 5 d10 6 p6 7 s2 5 f3 6 d1
1. I. The element is an inner transition element and paramagnetic
II. It has the oxidation state(O.S) of +6 in its complex ion XO2+2
III. The number of its unpaired electrons is smaller than that of Sb
IV. It must gain 6 electrons to have the noble gas electron configuration
Which of the statements given above is/are correct?
a) I and II b) I and III
c) II and IV d) I,III and IV
e)II,III and IV
2. How many electrons of the element X do have the angular momentum quantum
number l > 2 ?
a) 14
b) 90
c) 31
d)17
e)5
3. How many electrons of the element X do conform to the condition │ml-2│ > n, where
n is the principal quantum number and ml is the magnetic quantum number of the
electron?
a) 12
b)10
c) 8
d) 6
e)4
2
2
4. How many electrons do conform to the condition n – l > 9, where n= the principal
quantum number and l=angular momentum quantum number of the electron
a) 35
b) 27
c) 42
d) 58
e)50
5. Arrange the following ions and atoms according to their atomic/ionic radius in the
increasing order : Ar, Ca+2, P-3, K+, Cla) P-3<Cl-<Ar<K+<Ca+2
b) Ar<K+<Ca+2<Cl-<P-3
c) Ca+2<Ar<Cl-<P-3<K+
d) Ca+2<K+<Ar<Cl-<P-3
e) Ca+2<K+<Cl-<P-3<Ar
For the questions from 6 to 11write your answer next to the question
The following atoms are given: Ag, As, Os, Co, Ge, Cr, I, Ga, Cs, Bi, S, Ti, Sr, Si, Xe
6. Which of them has the lowest first ionization energy?
7. Which of them is the smallest atom?
8. Which of them may have the highest negative electron affinity?
9. Which of them may have different oxidation states(O.S) in their compounds with
halogenes?
10. Which of them is ferromagnetic?
11. Which of them does have both a dull appearance and 6 valence electrons?
12. Which of the elements or ions given below does have more than 2 unpaired electrons
in its d orbital?
Fe+3, Mn+7, Ni, Sb, Ti+4
a) Fe+3
b)Mn+7
c) Ni
d)Sb
e)Ti+4
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1.A gaseous mixture composed of CO2 , NH3, O2 and C3H8 gases has beeen prepared
in an amount of 1 mole in the container A at a temperature of T1. The data related to
the gases in the container A ,before the valves have been switched on is :
PCO2=(PO2+PNH3)/2
nC3H8=(2 nCO2+nO2 – nNH3)/3 ;
nC3H8/nNH3 =4/3
As shown in the figure , the valve(V2) is switched on and some of O2 is transferred from
container B to the container A and at the same temperature T1 the effusion rate of O2 is
measured u=501,87 m/s . After V2 was switched off , (without waiting) the valve(V1) is
turned on and NH3 is delivered to the container A at T1. The total duration of the effusion for
both gases is 57 min. (tNH3 + tO2 =57 min) After V1 was turned off, the container A was
heated up to 80°C.The total pressure in container A measured at that temperature is 0,8391
atm.
a)Calculate the partial pressure of NH3(PNH3) in the container A at the beginning?
b)Calculate the mole fraction of O2 at T=80°C
c) What is the time required to fill in the container A by 70% volume with O2 at T1?
(C=12 ; O=16 ; N=14 ; H=1 )
2.A container of 62 L volume is filled with O2 gas and an unknown gaseous sample
containing C,H and O atoms at 585 mm Hg and 80°C. The mass ratio of C to O atoms in
the sample is given as
𝑚𝐶
𝑚𝑂
=
3
4
After the combustion reaction has been completed, the rate of combustion efficiency is
calculated as 60% and the partial pressure of CO2 is determined 3 times as great as that of
the remaining sample. (PCO2 = 3xPsample ). It is also known that uCO2 = 1,1678 x usample ,
where u=diffusion rate at the same temperature. If the final temperature of the vessel is
measured as 62°C (C=12 ; H=1 ; O=16 g/mol)
CaHbOc(g) + O2(g)
CO2(g) + H2O(g)
a) Determine the molecular formula of the sample
b) Determine the amount of H2O(l) produced in g
c) Determine the partial pressure of CO2