Question

Given below are the atomic radius of three elements belong to same period e
Element. A. B. C
atomic radii 1.31. 1.52 1.94

Which element has lower atomic number and highest atomic number
On the basis of electronic configeration how will you identify the first and last element of a period

Answer 1

Element C has lower atomic number and element A has highest atomic number.

Element C is 1st element and element A is last element. Because atomic radii decreases along a period.

Answer 2

Element C has lower atomic number and element A has highest atomic number.

Element C is 1st element and element A is last element.