if a proton has a relative mass of 1 unit and a relative charge of +1 unit .what is the接上relative mass and charge of :1.a neutron2.an electron?

if a proton has a relative mass of 1 unit and a relative charge of +1 unit .what is the接上relative mass and charge of :1.a neutron2.an electron?
if a proton has a relative mass of 1 unit and a relative charge of +1 unit .what is the
接上relative mass and charge of :1.a neutron
2.an electron?

if a proton has a relative mass of 1 unit and a relative charge of +1 unit .what is the接上relative mass and charge of :1.a neutron2.an electron?
质子,中子,电子...有什么关系?
化学知识忘没了.
搞清它们关系了应该就能选出来了.