Question

13.atom a: 11 protons, 12 neutrons, 11 electrons
atom b: 11 protons, 14 neutrons, 11 electrons
compare atom a and atom b in terms of atomic number, mass number, and classification (are they the same element or different element?). explain your reasoning.

Explanation:

Step1: Determine atomic number

Atomic number = number of protons. For both Atom A and Atom B, the number of protons is 11, so the atomic number is 11 for both.

Step2: Calculate mass number

Mass number = number of protons + number of neutrons. For Atom A, mass number = 11 + 12 = 23. For Atom B, mass number = 11+14 = 25.

Step3: Determine element classification

Elements are defined by their atomic number. Since both atoms have an atomic number of 11, they are the same element (sodium). The difference in mass number is due to different numbers of neutrons, making them isotopes of sodium.

Answer:

Atomic number: Same (11 for both). Mass number: Different (23 for Atom A, 25 for Atom B). Classification: Same element (sodium) as they have the same atomic number.