Question

this is how krypton appears in the periodic table.
36
kr
krypton
83 80
rounded to the nearest whole number, how many protons are in an atom of krypton?
36
48
84
120

Explanation:

Step1: Recall proton number rule

In the periodic table, the atomic number (the top number) equals the number of protons in an atom.

Step2: Identify krypton's atomic number

Krypton's atomic number is 36 (the top number in its periodic table box). So the number of protons is 36, and rounding (though 36 is already a whole number) gives 36.

Answer:

A. 36