Kossel-Lewis Theory or Electronic Theory of Valency
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CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313676 The maximum valence of an element with atomic number 7 is

1 2
2 5
3 4
4 3
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313677 An atom A has 2K, 8L and 3M electrons. Another atom B has 2 K and 6 L electrons. The formula of the compound formed between A and B is

1 \({\rm{AB}}\)
2 \({{\rm{A}}_{\rm{2}}}{{\rm{B}}_{\rm{3}}}\)
3 \({{\rm{A}}_{\rm{3}}}{{\rm{B}}_{\rm{2}}}\)
4 \({\rm{A}}{{\rm{B}}_{\rm{2}}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313678 An element A belongs to IIA group and another element B belongs to VIA group. The compound formed between A and B contains

1 \({{\rm{A}}^{{\rm{ + 2}}}}{\rm{,}}\,\,{{\rm{B}}^{\rm{ - }}}\,\,{\rm{ions}}\)
2 \({{\rm{A}}^{{\rm{ + 2}}}}{\rm{,}}\,\,{{\rm{B}}^{{\rm{ - 2}}}}\,\,{\rm{ions}}\)
3 \({{\rm{A}}^{{\rm{ - 2}}}}{\rm{,}}\,\,{{\rm{B}}^{{\rm{ + 2}}}}\,\,{\rm{ions}}\)
4 \({{\rm{A}}^{\rm{ + }}}{\rm{,}}\,\,{{\rm{B}}^{{\rm{ - 2}}}}\,\,{\rm{ions}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313679 An element A is tetravalent and another element B is divalent. The formula of the compound formed by the combination of these elements is

1 \({{\rm{A}}_{\rm{2}}}\,{\rm{B}}\)
2 \({\rm{A}}\,\,{\rm{B}}\)
3 \({\rm{A}}\,\,{{\rm{B}}_{\rm{2}}}\)
4 \({{\rm{A}}_{\rm{2}}}{{\rm{B}}_{\rm{3}}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313680 Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is \({\rm{1}}{{\rm{s}}^{\rm{2}}}\,\,{\rm{2}}{{\rm{s}}^{\rm{2}}}\,\,{\rm{2}}{{\rm{p}}^{\rm{3}}}{\rm{,}}\) the simplest formula for this compound is

1 \({\rm{M}}{{\rm{g}}_{\rm{2}}}{\rm{X}}\)
2 \({\rm{M}}{{\rm{g}}_{\rm{3}}}{{\rm{X}}_{\rm{2}}}\)
3 \({\rm{Mg}}{{\rm{X}}_{\rm{2}}}\)
4 \({\rm{M}}{{\rm{g}}_{\rm{2}}}{{\rm{X}}_{\rm{3}}}\)
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CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313676 The maximum valence of an element with atomic number 7 is

1 2
2 5
3 4
4 3
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313677 An atom A has 2K, 8L and 3M electrons. Another atom B has 2 K and 6 L electrons. The formula of the compound formed between A and B is

1 \({\rm{AB}}\)
2 \({{\rm{A}}_{\rm{2}}}{{\rm{B}}_{\rm{3}}}\)
3 \({{\rm{A}}_{\rm{3}}}{{\rm{B}}_{\rm{2}}}\)
4 \({\rm{A}}{{\rm{B}}_{\rm{2}}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313678 An element A belongs to IIA group and another element B belongs to VIA group. The compound formed between A and B contains

1 \({{\rm{A}}^{{\rm{ + 2}}}}{\rm{,}}\,\,{{\rm{B}}^{\rm{ - }}}\,\,{\rm{ions}}\)
2 \({{\rm{A}}^{{\rm{ + 2}}}}{\rm{,}}\,\,{{\rm{B}}^{{\rm{ - 2}}}}\,\,{\rm{ions}}\)
3 \({{\rm{A}}^{{\rm{ - 2}}}}{\rm{,}}\,\,{{\rm{B}}^{{\rm{ + 2}}}}\,\,{\rm{ions}}\)
4 \({{\rm{A}}^{\rm{ + }}}{\rm{,}}\,\,{{\rm{B}}^{{\rm{ - 2}}}}\,\,{\rm{ions}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313679 An element A is tetravalent and another element B is divalent. The formula of the compound formed by the combination of these elements is

1 \({{\rm{A}}_{\rm{2}}}\,{\rm{B}}\)
2 \({\rm{A}}\,\,{\rm{B}}\)
3 \({\rm{A}}\,\,{{\rm{B}}_{\rm{2}}}\)
4 \({{\rm{A}}_{\rm{2}}}{{\rm{B}}_{\rm{3}}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313680 Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is \({\rm{1}}{{\rm{s}}^{\rm{2}}}\,\,{\rm{2}}{{\rm{s}}^{\rm{2}}}\,\,{\rm{2}}{{\rm{p}}^{\rm{3}}}{\rm{,}}\) the simplest formula for this compound is

1 \({\rm{M}}{{\rm{g}}_{\rm{2}}}{\rm{X}}\)
2 \({\rm{M}}{{\rm{g}}_{\rm{3}}}{{\rm{X}}_{\rm{2}}}\)
3 \({\rm{Mg}}{{\rm{X}}_{\rm{2}}}\)
4 \({\rm{M}}{{\rm{g}}_{\rm{2}}}{{\rm{X}}_{\rm{3}}}\)
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CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313676 The maximum valence of an element with atomic number 7 is

1 2
2 5
3 4
4 3
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313677 An atom A has 2K, 8L and 3M electrons. Another atom B has 2 K and 6 L electrons. The formula of the compound formed between A and B is

1 \({\rm{AB}}\)
2 \({{\rm{A}}_{\rm{2}}}{{\rm{B}}_{\rm{3}}}\)
3 \({{\rm{A}}_{\rm{3}}}{{\rm{B}}_{\rm{2}}}\)
4 \({\rm{A}}{{\rm{B}}_{\rm{2}}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313678 An element A belongs to IIA group and another element B belongs to VIA group. The compound formed between A and B contains

1 \({{\rm{A}}^{{\rm{ + 2}}}}{\rm{,}}\,\,{{\rm{B}}^{\rm{ - }}}\,\,{\rm{ions}}\)
2 \({{\rm{A}}^{{\rm{ + 2}}}}{\rm{,}}\,\,{{\rm{B}}^{{\rm{ - 2}}}}\,\,{\rm{ions}}\)
3 \({{\rm{A}}^{{\rm{ - 2}}}}{\rm{,}}\,\,{{\rm{B}}^{{\rm{ + 2}}}}\,\,{\rm{ions}}\)
4 \({{\rm{A}}^{\rm{ + }}}{\rm{,}}\,\,{{\rm{B}}^{{\rm{ - 2}}}}\,\,{\rm{ions}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313679 An element A is tetravalent and another element B is divalent. The formula of the compound formed by the combination of these elements is

1 \({{\rm{A}}_{\rm{2}}}\,{\rm{B}}\)
2 \({\rm{A}}\,\,{\rm{B}}\)
3 \({\rm{A}}\,\,{{\rm{B}}_{\rm{2}}}\)
4 \({{\rm{A}}_{\rm{2}}}{{\rm{B}}_{\rm{3}}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313680 Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is \({\rm{1}}{{\rm{s}}^{\rm{2}}}\,\,{\rm{2}}{{\rm{s}}^{\rm{2}}}\,\,{\rm{2}}{{\rm{p}}^{\rm{3}}}{\rm{,}}\) the simplest formula for this compound is

1 \({\rm{M}}{{\rm{g}}_{\rm{2}}}{\rm{X}}\)
2 \({\rm{M}}{{\rm{g}}_{\rm{3}}}{{\rm{X}}_{\rm{2}}}\)
3 \({\rm{Mg}}{{\rm{X}}_{\rm{2}}}\)
4 \({\rm{M}}{{\rm{g}}_{\rm{2}}}{{\rm{X}}_{\rm{3}}}\)
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CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313676 The maximum valence of an element with atomic number 7 is

1 2
2 5
3 4
4 3
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313677 An atom A has 2K, 8L and 3M electrons. Another atom B has 2 K and 6 L electrons. The formula of the compound formed between A and B is

1 \({\rm{AB}}\)
2 \({{\rm{A}}_{\rm{2}}}{{\rm{B}}_{\rm{3}}}\)
3 \({{\rm{A}}_{\rm{3}}}{{\rm{B}}_{\rm{2}}}\)
4 \({\rm{A}}{{\rm{B}}_{\rm{2}}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313678 An element A belongs to IIA group and another element B belongs to VIA group. The compound formed between A and B contains

1 \({{\rm{A}}^{{\rm{ + 2}}}}{\rm{,}}\,\,{{\rm{B}}^{\rm{ - }}}\,\,{\rm{ions}}\)
2 \({{\rm{A}}^{{\rm{ + 2}}}}{\rm{,}}\,\,{{\rm{B}}^{{\rm{ - 2}}}}\,\,{\rm{ions}}\)
3 \({{\rm{A}}^{{\rm{ - 2}}}}{\rm{,}}\,\,{{\rm{B}}^{{\rm{ + 2}}}}\,\,{\rm{ions}}\)
4 \({{\rm{A}}^{\rm{ + }}}{\rm{,}}\,\,{{\rm{B}}^{{\rm{ - 2}}}}\,\,{\rm{ions}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313679 An element A is tetravalent and another element B is divalent. The formula of the compound formed by the combination of these elements is

1 \({{\rm{A}}_{\rm{2}}}\,{\rm{B}}\)
2 \({\rm{A}}\,\,{\rm{B}}\)
3 \({\rm{A}}\,\,{{\rm{B}}_{\rm{2}}}\)
4 \({{\rm{A}}_{\rm{2}}}{{\rm{B}}_{\rm{3}}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313680 Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is \({\rm{1}}{{\rm{s}}^{\rm{2}}}\,\,{\rm{2}}{{\rm{s}}^{\rm{2}}}\,\,{\rm{2}}{{\rm{p}}^{\rm{3}}}{\rm{,}}\) the simplest formula for this compound is

1 \({\rm{M}}{{\rm{g}}_{\rm{2}}}{\rm{X}}\)
2 \({\rm{M}}{{\rm{g}}_{\rm{3}}}{{\rm{X}}_{\rm{2}}}\)
3 \({\rm{Mg}}{{\rm{X}}_{\rm{2}}}\)
4 \({\rm{M}}{{\rm{g}}_{\rm{2}}}{{\rm{X}}_{\rm{3}}}\)
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CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313676 The maximum valence of an element with atomic number 7 is

1 2
2 5
3 4
4 3
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313677 An atom A has 2K, 8L and 3M electrons. Another atom B has 2 K and 6 L electrons. The formula of the compound formed between A and B is

1 \({\rm{AB}}\)
2 \({{\rm{A}}_{\rm{2}}}{{\rm{B}}_{\rm{3}}}\)
3 \({{\rm{A}}_{\rm{3}}}{{\rm{B}}_{\rm{2}}}\)
4 \({\rm{A}}{{\rm{B}}_{\rm{2}}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313678 An element A belongs to IIA group and another element B belongs to VIA group. The compound formed between A and B contains

1 \({{\rm{A}}^{{\rm{ + 2}}}}{\rm{,}}\,\,{{\rm{B}}^{\rm{ - }}}\,\,{\rm{ions}}\)
2 \({{\rm{A}}^{{\rm{ + 2}}}}{\rm{,}}\,\,{{\rm{B}}^{{\rm{ - 2}}}}\,\,{\rm{ions}}\)
3 \({{\rm{A}}^{{\rm{ - 2}}}}{\rm{,}}\,\,{{\rm{B}}^{{\rm{ + 2}}}}\,\,{\rm{ions}}\)
4 \({{\rm{A}}^{\rm{ + }}}{\rm{,}}\,\,{{\rm{B}}^{{\rm{ - 2}}}}\,\,{\rm{ions}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313679 An element A is tetravalent and another element B is divalent. The formula of the compound formed by the combination of these elements is

1 \({{\rm{A}}_{\rm{2}}}\,{\rm{B}}\)
2 \({\rm{A}}\,\,{\rm{B}}\)
3 \({\rm{A}}\,\,{{\rm{B}}_{\rm{2}}}\)
4 \({{\rm{A}}_{\rm{2}}}{{\rm{B}}_{\rm{3}}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313680 Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is \({\rm{1}}{{\rm{s}}^{\rm{2}}}\,\,{\rm{2}}{{\rm{s}}^{\rm{2}}}\,\,{\rm{2}}{{\rm{p}}^{\rm{3}}}{\rm{,}}\) the simplest formula for this compound is

1 \({\rm{M}}{{\rm{g}}_{\rm{2}}}{\rm{X}}\)
2 \({\rm{M}}{{\rm{g}}_{\rm{3}}}{{\rm{X}}_{\rm{2}}}\)
3 \({\rm{Mg}}{{\rm{X}}_{\rm{2}}}\)
4 \({\rm{M}}{{\rm{g}}_{\rm{2}}}{{\rm{X}}_{\rm{3}}}\)
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