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Q.

Which of the following elements has the highest atomic number?

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a

Rubidium

b

Potassium

c

Cesium

d

Francium

answer is D.

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Detailed Solution

  • In the horizontal rows of the modern periodic table, the elements are arranged according to increasing atomic number.
  • To forecast the properties of elements, we use the modern periodic table.
  • The atomic numbers of Rubidium, Cesium, Potassium and Francium are 37,55,19 and 87 respectively. 
  • Francium, with an atomic number of 87, is the highest among the elements listed.
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Which of the following elements has the highest atomic number?