Answer:
1. Ionic compound- 
2. Polar molecular compound- 
Explanation:
Magnesium (Mg), with atomic number 12, has an electron configuration of 
. The outermost shell possesses 2 electrons, thus it loses these 2 electrons to become 
ions. Bromine (Br), a nonmetal with atomic number 35, has an electron configuration of 
. Its outermost shell holds 7 electrons, allowing it to accept one electron and thus forms 
. Hence, the magnesium ion and bromide ion bond together to form an ionic compound .
Phosphorus (P), also a nonmetal, bonds with bromine covalently. Due to differing electronegativities, they produce polar covalent compounds like .
A total of 1.505×10^23 lead atoms
In the lungs, the volume of lead equals the total lung volume, which is 5.60L
1 mole corresponds to 22.4L
Thus, 5.6L of lead converts to 5.6/22.4 = 0.25 moles
According to Avogadro's law
1 mole of lead contains 6.02×10^23 lead atoms
Thus, 0.25 moles of lead equates to 0.25×6.02×10^23 = 1.505×10^23 lead atoms
