which of the following describes the electron sharing between two oxygen atoms?
a. each oxygen shares six electrons with with the other
b. each oxygen shares one electron with the other
c. each oxygen shares eight electrons with the other
d. each oxygen shares two electrons with the other

The correct option is D.

Oxygen has an atomic number of 8 and its configuration is 2, 6. For an atom to attain the octet structure it must have 8 electrons in its outermost shell, this implies that oxygen needs two more electrons to attain stability. In order to attain the octet structure, two oxygen atoms will donate two electrons each and share these electrons between themselves, thus, each atom will have 8 electrons in its outermost shell. This type of bond formation is called covalent bond.

a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.