Which of the following has a complete sub-shell?
Mg
Si
Co
Cl
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Which of the following has a complete sub-shell?
Mg
Si
Co
Cl
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The electron configuration of metal M is 1s22s22p63s2
What is the formula of a compound formed when metal M reacts with oxygen?
MO
MO2
M2O
M2O3
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Which shows the correct number of electrons that can be held in each of the following?
3rd shell | p sub-shell | p orbital | |
A | 8 | 2 | 6 |
B | 8 | 6 | 2 |
C | 18 | 2 | 6 |
D | 18 | 6 | 2 |
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Which of the following is the electron configuration of an atom with an atomic number of 36?
1s22s22p63s13p64s24p63d10
1s22s22p63s23p63d104p65s2
1s22s22p63s23p64s23d10
1s22s22p63s23p64s23d104p6
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What is the correct sequence for the orbitals shown in an atom of iron in order of increasing energy?
3s 3p 4s 3d
3p 4s 3d 4p
3d 4s 3p 3s
3s 3p 3d 4s
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Which of the following compounds is not bonded ionically?
CH3OH
MgCO3
LiOH
BaCl2
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Which statement about the electrical conductivity of sodium sulfide is correct?
It conducts when solid and liquid
It conducts when solid but not when liquid
It conducts when liquid but not when solid
It does not conduct when liquid or solid
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Which of the following contains a dative covalent bond?
N2
NH3
CN-
NH4+
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Magnesium oxide has a very high melting temperature.
Which of the following is the best description of its structure and bonding?
Giant ionic
Giant metallic
Macromolecular
Simple molecular
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Which crystal structure does not conduct electricity when solid, has a high melting point and can conduct electricity when molten?
Giant metallic
Giant ionic
Macromolecular
Simple molecular
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Atoms of an unknown element contain six unpaired electrons.
What could the unknown element be?
Argon
Carbon
Chromium
Iron
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What is the electronic configuration of the ion with a single negative charge and the atomic number 35?
1s2 2s2 2p6 3s2 3p6
1s2 2s2 2p6 3s2 3p5
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
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Which of the following compounds has both covalent and ionic bonds?
Calcium chloride, CaCl2
Sodium nitrate, NaNO3
Propanoic acid, CH3CH2COOH
1,2-dibromoethane, CH2BrCH2Br
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When can sodium chloride conduct electricity?
Solid | Molten | Aqueous | |
A | ✓ | ✓ | X |
B | ✓ | X | ✓ |
C | X | ✓ | ✓ |
D | X | X | ✓ |
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Which of the following statements about ions and ionic compounds are true?
1, 2 and 3
Only 1 and 2
Only 2 and 3
Only 1
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Which statement about bonding is not correct?
Covalent bonding is the strong electrostatic attraction between the nuclei of the bonded atoms.
A dative covalent bond is a covalent bond where both electrons in the bond come from the same atom.
Ionic bonding is the strong electrostatic attraction between oppositely charged particles.
Dative covalent bonding requires an electron-deficient compound.
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Which element has the greatest number of singly occupied orbitals?
Si
F
Be
Ga
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Which chemical has the highest melting point?
Sulfur
Calcium oxide
Lithium
Sodium fluoride
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Which species contain dative covalent bonds?
1, 2 and 3
Only 1 and 2
Only 2 and 3
Only 1
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How many orbitals are occupied in a silicon atom?
5
7
8
9
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Which of the following statements about electrons filling orbitals is/are correct?
1, 2 and 3
Only 1 and 2
Only 2 and 3
Only 1
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What are the electron configurations of V2+ and As3- respectively?
A |
1s22s22p63s23p63d14s2 |
1s22s22p63s23p63d104s24p6 |
B |
1s22s22p63s23p63d14s2 |
1s22s22p63s23p63d104s14p6 |
C |
1s22s22p63s23p63d3 |
1s22s22p63s23p63d104s24p6 |
D |
1s22s22p63s23p63d3 |
1s22s22p63s23p63d104s14p6 |
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What is the correct order for the melting points of the following metal oxides?
Na2O > MgO > CaO
MgO > CaO > Na2O
MgO > Na2O > CaO
Na2O > CaO > MgO
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Which statements about boron trichloride (BCl3), aluminium chloride (Al2Cl6), and the product of the reaction between hydrochloric acid and ethylamine is/are correct?
1, 2 and 3
Only 1 and 2
Only 2 and 3
Only 1
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