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Q.

Which of the following element has lowest atomic number?

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a

B

b

Al

c

Ga

d

In

answer is A.

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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 B, Al, Ga and In are 5, 13, 31, and 49, respectively. 
  • B has the lowest atomic number, 5.
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