Is anyone just falling apart? I have a friend who I love so much and shes angry with me for good reason. A friend that is like a brother to me and hes going into the Marines and I'm terrified bc my grandpa died in the Marines and I can't lose my bsf. My other bsf is busy and can't talk rn. I'm literally having an anxiety attack and id k what to do. I just want to give up but ik I can't. If you 3 are seeing this (not including my fam but i love you guys too lol) I love you guys so much, you dont even know.

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?