What is ecology and what is ecosystem

Ecosystem :

Any living organism interacting with its physical environment by any means is known as Ecosystem.

Ecology :

Ecology is the study of the ecosystem. In this field of biology, we study how an organism interact with its physical environment and how the environment respond.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.