The nucleus of an atom is composed of 4 protons and 5 neutrons. How many electrons surrounded the nucleus of this atom? 1
4
5
9

In an atom the no. of proton is equal to the no. of electron

= 4 electron

are you like autistic or something?

xd

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.