Question

Elements abcd,and e have atomic no. 4,9,13,17,and 20 respectively

Answer 1

4= berellium

9=flourine

13=aluminium

17=chlorine

20=calcium

Answer 2

Hi
If you want the name of the element then,
a - Beryllium (Be)
b - Fluorine (F)
c - Aluminium (Al)
d - Chlorine (Cl)
e - Calcium (Ca)

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