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Answer:
here I just googled this for you I hope it helps
<h3>
Answer:</h3>
s-sub-level and p-sub-level
<h3>
Explanation:</h3>
- Group 18 elements in the periodic table are known as noble gases.
- They have an octet configuration with their outermost s and p-sub-levels full, which makes them inert or nonreactive.
- The s-sub-level takes up a maximum of 2 electrons while the p-sub-level holds a maximum of 6 electrons.
- They include, argon, neon, xenon, krypton, etc.
- Their electron configuration shows full outermost s and p-sub-levels.
- For example; the electron configuration of Ne is 1s²2s²2p⁶, with full s and p sub-levels.
Largest
K
Ca
Ga
Ge
As
Br
Kr
Smallest
Answer 1.) Eu3+ ( Europium with charge of + 3 ) Answer 2.) Sn-188 with a -2 charge So, we know that 50 protons = the atomic mass= Sn (tin) Now, we have to find the atomic mass/ atomic mass= protons+neutrons/ plugin= 50 protons+ 68 neutrons= 118 amu (atomi mass unit) Then , we have 48 eletrons ( e-) - ( 50 protons ( positive chage ))= -2 charge! Final plugin: Sn-188 with a -2 charge.