Phosphorus (P) has an isotope that has an atomic number of 15 and an atomic mass of 32. Answer the following questions about this isotope. (2 points)

i. How would it be identified in isotope notation? (1 point)

ii. How many neutrons does this isotope have? (1 point)

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

What is the temperature of one mole of helium gas at stp?

Select the correct value for the indicated bond angle in each of the compounds. o−o−oo−o−o angle of o3 90° 109.5° < 109.5° 120° < 120° 180° f−b−ff−b−f angle of bf3 180° < 109.5° < 120° 120° 109.5° 90° f−o−ff−o−f angle of of2 < 120° 120° 90° 109.5° 180° < 109.5° cl−be−clcl−be−cl angle of becl2 90° 109.5° 180° 120° < 109.5° < 120° f−p−ff−p−f angle of pf3 90° 109.5° < 109.5° 180° 120° < 120° h−c−hh−c−h angle of ch4 90° < 109.5° 180° 120° < 120° 109.5°