Question

sep develop models each helium atom has two protons. sketch models of helium-3 and helium-4, which have approximate masses of 3 amu and 4 amu, respectively. label and differentiate protons, neutrons, and electrons in your models.

Explanation:

Step1: Recall atomic - structure basics

The atomic number (Z) of helium is 2, so the number of protons in both helium - 3 and helium - 4 is 2. The mass number (A) is the sum of protons and neutrons (A = p + n), where p is the number of protons and n is the number of neutrons.

Step2: Calculate neutrons in helium - 3

For helium - 3, A = 3 and p = 2. Using the formula A = p + n, we get n = A - p. So, n = 3 - 2=1 neutron. Helium is neutral, so the number of electrons (e) is equal to the number of protons, e = 2.

Step3: Calculate neutrons in helium - 4

For helium - 4, A = 4 and p = 2. Using the formula A = p + n, we get n = A - p. So, n = 4 - 2 = 2 neutrons. And e = 2 electrons since it is neutral.

Step4: Sketch the models

For helium - 3: Draw two small circles labeled "p" for protons, one small circle labeled "n" for the neutron, and two small circles labeled "e" outside the nucleus to represent electrons.
For helium - 4: Draw two small circles labeled "p" for protons, two small circles labeled "n" for neutrons, and two small circles labeled "e" outside the nucleus to represent electrons.

Answer:

Sketch a model of helium - 3 with 2 protons, 1 neutron, and 2 electrons. Sketch a model of helium - 4 with 2 protons, 2 neutrons, and 2 electrons, labeling protons, neutrons, and electrons appropriately.