Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions

Given below are some elements of the modern periodic table : (3)4Be, 9Fe, 14Si, 19K, 20Ca(i) Select the element that has one electron in the outermost

shell and write its electronic configuration.(ii) Select two elements that belong to the same group. Give reason for your answer.(iii) Select two elements that belong to the same period. Which one of the two has bigger atomic size?


1)K(potassium) has one electron 2,8,8,1 2)Be and Ca as they have same no of valence electron Be2,2 Ca2,8,8,2 3) K & Ca belong to same group K has bigger atomic size as it belongs to 1st group and Ca belong to 2nd.Atomic size decreases as we go from left to right
0 0 0
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts