Question

Which of the following is an example of beneficial elements
1. Ni
2. Mn
3. Na
4. Pb​

Answer 1

Answer:

all of these are beneficial elements

I hope you mark me as brainlist

and follow me

Answer 2

pb (lead)

as it is used to make fireworks and other pyrotechniques ....

{i hope this answer helped u , please mark it as a brainliest one, thanks :)}