2. Realice la configuración electrónica de los siguientes elementos, dibuje la estructura del átomo y diga a que grupo pertenece, periodo, electrones
desapareados y del último nivel:
a) PLOMO
b) SODIO c) ORO d) CLORO
e) ASTATO​

Can someone me with 1 to 4 plz. fast

Sodium nitrite (nano2) reacted with 2−iodooctane to give a mixture of two constitutionally isomeric compounds of molecular formula c8h17no2 in a combined yield of 88%. draw reasonable structures for these two isomers. click the "draw structure" button to launch the drawing utility. place the two compounds in the appropriate boxes below.

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?