The is a gaseous envelope that surrounds a planet or any other celestial body.

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.

What is the chemical formula for the compound formed between sodium and flour one

Give one example of a pure (exact) number and of an estimated (measured) number.