20. What is the reactant in the following equation? 2NaHCO3 -- Na2CO3 + CO2 + H2O*

a) NaHCO3
b) CO2
c) Na2CO3
d) H20

chemists can use the electron cloud model to assign electrons to different atomic orbitals. atomic orbitals also explain the patterns in the periodic table

explanation:

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

hope i !