Question

1.) An element A has valency +2 while another element B has valency -3. Give the formula of their compound formed when A react with B.
2.)Draw electronic configuration of sodium (atomic number 11) and Argon (atomic number 18) .

Answer 1

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⏩ An element A has valency +2 while another element B has valency -3

${A}^{2 + } \: \: \: {B}^{3 - } \\ After \: the \: valency \: criss \: cross \: \\ A3B2$

⏩ electronic configuration of sodium (atomic number 11)

$1 {s}^{2} \: 2 {s}^{2} \: 2 {p}^{6} \: 3 {s}^{1}$

⏩ electronic configuration of Argon (atomic number 18)

$1 {s}^{2} \: 2 {s}^{2} \: 2 {p}^{6} \: 3 {s}^{2} \: 3 {p}^{6}$


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