Atmospheric oxygen DID increase after the evolution of photosynthetic prokaryotes. So It is true.
Answer:
What is the specific heat for the aluminum wire?
0.82
What is the specific heat for the steel wire?
0.47
What is the specific heat for the lead pellets?
0.25
Explanation:
Answer:
45) Ca < Co < Se
46) Te < S < O
Explanation:
These questions are talking about periodic trends. Here are some things to know about periodic trends:
Electronegativity
- how well an element attracts an electron
- increases left to right and bottom to top on the periodic table
- noble gases are not included
- fluorine is most electronegative element, Francium is least
Atomic Radius
- the distance between nuclei
- increases from right to left and top to bottom on the periodic table
- the more electronegative an element is, the smaller it's atomic radius
- Francium has the largest atomic radius while fluorine has the smallest
Ionization Energy
- the energy required to remove an electron
- directly proportional to electronegativity
Metallic Character
- how closely an element's properties match those of a metal
- directly proportional with atomic radius
Hope this helps :)
Answer is: the total number of electrons shared between the atoms is four.
Molecule of oxygen is nonpolar because double linear bonds (O=O).
Oxygen (O) is an element with atomic number 8, it means it has eight protons and eight electrons, so atom has neutral charge. Oxygen is a nonmetal.
Electron configuration of oxygen atom: ₈O 1s² 2s² 2p⁴.
Oxygen atom has six valence electrons, so it is in 16 group of Periodic table of elements.
Two valence electrons from both oxygen atoms form double bond (O::O) at oxygen molecule.
