Plz help me get it right and no links

What neutral atom is isoelectronic to mn+4

Adeuteron, 21h, is the nucleus of a hydrogen isotope and consists of one proton and one neutron. the plasma of deuterons in a nuclear fusion reactor must be heated to about 3.02×108 k . what is the rms speed of the deuterons? express your answer using two significant figures.

What energy is it when you flip on a switch on a lamp