Question

Protons are made up of _____ up quarks and one down quark

Answer 1

`\Large \text{2}`

Step-by-step explanation:

1 up quark has a charge of +2/3

1 down quark has a charge of -1/3

And proton +1

2/3x+-1/3 = 1

x = 2

Answer 2

2 up quarks and one down quark