Calculate the ph of a 0.021 m nacn solution. [ka(hcn) = 4.9  10–10]

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

The clouds are grey and ground is wet. a quantitative b qualitative

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.