In the Bohr model of the hydrogen atom, the electron occupies distinct energy states. One transition between energy states of the hydrogen atom is represented by the picture on the left.
1. In this transition an electron moves from the n = level to the n = level.
2. Energy is in this process.
A. Absorbed
B. Emitted
3. The electron moves the nucleus.
A. Closer to
B. Further from

In this transition, energy is emitted

The electron moves closer to the nucleus

Explanation:

In the Bohr's model of the atom, electrons occupy specific energy levels shown by the principal quantum number. An electron that is stationary in its orbit does not radiate energy.

However, an electron may absorb energy and be excited to higher energy levels or emit energy when descending from a higher to a lower energy level. This energy is usually observed as a photon of light of appropriate wavelength and frequency.

In the image, the electron descends from energy level n=4 to energy level n=1. Since it has moved from a higher to a lower energy level, energy is emitted. Recall that energy levels increase outwards from the nucleus. Since n=1 is closest to the nucleus, the electron has moved closer to the nucleus. Hence the answers above.

answer; 4 electrons;