During reduction, which of the following is true? a. electrons are gained, so the oxidation number increases. b. electrons are gained, so the oxidation number decreases. c. electrons are given off, so the oxidation number increases. d. electrons are given off, so the oxidation number decreases.

B. Electrons are gained, so the oxidation number decreases.

Explanation:

Reduction is the gain of electrons.

Oxidation number is the charge that an atom appears to have when we count its electrons in a specific way.

Electrons have a negative charge so, if an atom gains electrons, its charge (oxidation number) becomes more negative. The oxidation number decreases.

If electrons are given off, the atom is being oxidized. Loss of electrons is oxidation.

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.      

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.