PL HELP 6.203g of na2co3.xh2o was dissolved in water and the solution made up of 1000cm3.if 25cm3 of this solution requires 20.5cm3 of 0.122moldm3 hydrochloric acid for complete neutralisation, calculate the mass of the hydrated salt​

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

Why is carbon ideal for making different compounds?

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.