Question

which of these elements belong to the third group? 4Be, 6C, 8O, 5B, 13Al​

Answer 1

Answer:

4

Be,

6

C,

8

O,

5

B,

13

Al

Electronic configuration of the following elements is:

4

Be=2,2

6

C=2,4

8

O=2,6

5

B=2,3

13

Al=2,8,3

13

Al is the most electropositive element among these because

4

Be,

6

C,

8

O,

5

B belong to the same period, but

13

Al belongs to next period. According to the trend, the electropositive character of an element increases as we move from top to bottom in a group of the periodic table.