Question

isotopes of an element have a different number of protons but the same n
isotopes of an element have the same number of protons and the same n
isotopes of an element have the same number of protons but a different n
isotopes of an element have a different number of protons and a different

1. use the periodic table to write the correct answer.

what is the isotopic notation for the isotope krypton - 84?
kr$_{84}^{36}$
$_{84}^{36}$kr
$_{36}^{84}$kr
kr$_{36}^{84}$

1. type in the correct answer.

Explanation:

Isotopes of an element have the same number of protons (which determines the element's identity) but a different number of neutrons. For isotopic notation, the mass - number (sum of protons and neutrons) is written as a superscript and the atomic number (number of protons) is written as a subscript before the element symbol. Krypton has an atomic number of 36 from the periodic table, and for krypton - 84, the mass - number is 84.

Answer:

C. $_{36}^{84}\text{Kr}$