The ionization energy of hydrogen atom is x kj. the energy required for an electron to jump from 2nd orbit to the 3rd orbit will

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

i think so it’s will be b yes i believe its

i believe it is a.) released into

explanation:

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.