A mystery element has 18 protons. Which one of the following statements is true about the element?

Helium, neon, argon, krypton, xenon, and radon are also noble gases, in order of density. These are termed noble gases as they're so magnificent that, in general, they do not react with something.

Therefore, the answer is "Its chemical is categorized as a noble gas that belongs to row 3 of the periodic table".

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My guess would be B

Step-by-step explanation:

idk

step-by-step explanation:

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!