neon, argon, argon, xenon, palladium (?!?) -- I wonder if they really meant Sn4-, which would've given the electronic configuration of xenon. I don't know if the electrons in Pd are really in the same subshells as you'd get with Sn4+, but palladium does have 46 electrons, which is the number of electrons in Sn4+.
Ca2+ ... has 18 e- ... use the periodic table .. look the element with atomic number 18
Mn7+ ... Use PT. look up Mn, how many e-? +7 charge eans it has LOST 7e- so atomic number Mn - 7 gives the At. number of the new element .. look it up.
Answers & Comments
neon, argon, argon, xenon, palladium (?!?) -- I wonder if they really meant Sn4-, which would've given the electronic configuration of xenon. I don't know if the electrons in Pd are really in the same subshells as you'd get with Sn4+, but palladium does have 46 electrons, which is the number of electrons in Sn4+.
F- ... has 10 e- ... Neon
Ca2+ ... has 18 e- ... use the periodic table .. look the element with atomic number 18
Mn7+ ... Use PT. look up Mn, how many e-? +7 charge eans it has LOST 7e- so atomic number Mn - 7 gives the At. number of the new element .. look it up.
you try the others