How many more electrons are there in the last energy level of phosphorus, atomic number 15, than there are in the last principal energy level of neon, atomic number 10?

When determining the shape of a molecule, it is important to draw a lewis dot structure first in order to see the total number a. electrons within the moleculeb. bonding and unshared pairs around central atomc. unshared pair within the molecule( i really need it )

Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h

Melissa is interested in her family tree and how her family has changed over its many generations. melissa probably more closely resembles