Classification: Oxygen is a chalcogen and a nonmetal
Color: colorless
Atomic weight: 15.9994
State: gas
Melting point: -218.3 oC, 54.8 K
Boiling point: -182.9 oC, 90.2 K
Electrons: 8
Protons: 8
Neutrons in most abundant isotope: 8
Electron shells: 2,6
Electron configuration: 1s2 2s2 2p4
Density @ 20oC:
External respiration hope this helps
Answer:
The structure of the heart The heart is a two-sided pump made up of four chambers: the upper two chambers called atria and the lower two called the ventricles.
Explanation:
On the right side of the heart, the right atrium and right ventricle work to pump oxygen-poor blood returning from the body back to the lungs to be reoxygenated.
