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Use process of elimination. Do you have any ideas?
what do isotopes have to do with protons??
isotopes of an element are the same but weigh differently according to the number of neutrons. since thallium-205 weighs more than thallium-203 (since 205>203) there cannot be fewer protons, that would lead to a completely different element (since atomic number is the number of protons)
hmm ok..... so its D
the fourth option
can u plz help me with this, idk how I got it wrong: http://prntscr.com/7hgpba
the atomic mass unit is an average of the thallium isotope number and how abundant it is in nature. Since the amu is closer to 205 than 203, you can infer that there is more thallium-205. The number has nothing to do with weight.
the answer to number 6 is the second option because thallium always has an atomic number of 81 and the atomic number is equal to the number of protons, which is why you got number 9 wrong.
The atomic number of an element never changes because it represents the number pf protons. If you change the number of protons, you have a completely different element. As previously stated.
do protons always stay the same? @mastermindkakashi
yes always the same
@mastermindkakashi is right!
can u please help me with studying for a final? i have a lot of questions @Ehsan18
I can try my best
Me to will try my best but having my exams too!!
plz help me with both quesionts on this, i dont understand it http://prntscr.com/7hh7nw
@Ehsan18 do u know this?
okay so on the periodic table, the higher up you go and the farther to the right is the most electronegative
I have to go, so just tag me with your questions and I can get back to you later. Sorry
ok, and how about 13? @Ehsan18 @mastermindkakashi
@rosiejd are you good with ionic compunds? do u know the basics?
no, sorry,havent taken the subject in years and i forgot.
oh woah that one is new doe, what is the lewis structures
https://dr282zn36sxxg.cloudfront.net/datastreams/f-d%3A3d4059a9ff59983ace0a329d34ef6d3ffb36a17fe950586fcb8f3db0%2BIMAGE%2BIMAGE.1 lewis dot structures just show the sharing of valence electrons @Lokid
okay ya sorry i wish i could help but that looks way more advanced than what i did DX so so sorry wish i could help
np thanks doe @Lokid