Question

table 6 - 1 gives information about the nuclei of four atoms. how many different elements are represented by the nuclei in the table?
nuclei of four atoms

atom	number of protons	number of neutrons
d	6	7
e	7	7
g	7	8

table 6 - 1

Explanation:

Step1: Recall element - defining property

The number of protons in an atom's nucleus defines the element.

Step2: Analyze proton numbers in table

Atom A has 6 protons, Atom B has 6 protons, Atom C has 7 protons, and Atom D has 7 protons.

Step3: Count distinct elements

Elements with 6 protons are one type, and elements with 7 protons are another type. So there are 2 distinct elements.

Answer:

2 (corresponding to the first option in the multiple - choice list)