Electronic configuration of the element with atomic number 56 and mass number 138 is

For the process&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>CO</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant="normal">s</mi><mo>)</mo><mo stretchy="false">→</mo><msub><mi>CO</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant="normal">g</mi><mo>)</mo></math>

The enthalpies of formation of all the elements in their standard states are

For the transition C(diam)&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mo>→</mo><mrow>&nbsp;</mrow></mover></math>&nbsp;C(graph); <math xmlns="http://www.w3.org/1998/Math/MathML"><mo>∆</mo></math>H = –1.5kJ. It follows that

The orthocentre of the triangle formed by the lines x + 3y – 10 = 0 and&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>6</mn><msup><mi>x</mi><mn>2</mn></msup><mo>+</mo><mi>x</mi><mi>y</mi><mo>−</mo><msup><mi>y</mi><mn>2</mn></msup><mo>=</mo><mn>0</mn><mtext>  </mtext><mi>i</mi><mi>s</mi></math>

If&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>A</mi></math>&nbsp;is the orthocenter of the triangle formed by&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>2</mn><msup><mi>x</mi><mn>2</mn></msup><mo>−</mo><msup><mi>y</mi><mn>2</mn></msup><mo>=</mo><mn>0</mn><mo>,</mo><mtext> </mtext><mi>x</mi><mo>+</mo><mi>y</mi><mo>−</mo><mn>1</mn><mo>=</mo><mn>0</mn><mtext> </mtext></math>,&nbsp;and&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>B</mi></math>&nbsp;is the centroid of the triangle formed by&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mtext> </mtext><mn>2</mn><msup><mi>x</mi><mn>2</mn></msup><mo>−</mo><mn>5</mn><mi>x</mi><mi>y</mi><mo>+</mo><mn>2</mn><msup><mi>y</mi><mn>2</mn></msup><mo>=</mo><mn>0</mn><mo>,</mo><mtext> </mtext><mn>7</mn><mi>x</mi><mo>−</mo><mn>2</mn><mi>y</mi><mo>−</mo><mn>12</mn><mo>=</mo><mn>0</mn><mo>,</mo></math>&nbsp; then the distance between&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>A</mi></math>&nbsp;and&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>B</mi></math>&nbsp;is

Electronic configuration of the element with atomic number 56 and mass number 138 is

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