I do award metals to those who help! I just need someone to tell me if my answers are right please!

Question

anonymous · Answer

1) Which of the following atoms contains the same number of neutrons as an atom of Fluorine-19?
neon-20
oxygen-19<---
sodium-22
nitrogen-16

anonymous · Answer

@nechirwan do you know if that one is correct?

anonymous · Answer

@helpout3 @HelpBlahBlahBlah do you know if this one is correct?

nechirwan · Answer

Fluorine: 19-9=10
Neon: 20-10=10
Oxygen: 19-8=11
Sodium: 22-11=11
Nitrogen: 16-7= 9

So Fluorine-19 has the same amount of neutrons as Neon-20

anonymous · Answer

I have a question, how do you know what to subtract? like how do you know to subtract 9 from 19, 10 from 20, etc?

nechirwan · Answer

19 is number of proton +neutron) - the number of proton u u get the number of neutron

anonymous · Answer

oh okay, got it. Thank you :-) I have another one

anonymous · Answer

Which of the following contains the greatest number of moles?
9.1x10^23 atoms Ag
4.7 mol Ag
1.3 mol fe
56 g fe

anonymous · Answer

I am thinking A

nechirwan · Answer

what is mole rule?

nechirwan · Answer

sorry the rule is wrong

anonymous · Answer

it's okay. But I forget the mole rule

nechirwan · Answer

mole = mo. of atom div by Avogadro number

anonymous · Answer

that looks so confusing lol