I WILL PAYPAL U $15 FOR HELPING. IM SO SERIOUS. due in 50 min

1. Explain how the model of the atom has changed over time.

2. How was the atomic theory able to be changed over time?

3. Does the term indivisible still accurately describe the atom? Explain.

Task# 2: The Structure of Atoms

1. Use the items that your teacher gives you to build a model of an atom. Assign one color to represent each subatomic particle of your atom.

Color Subatomic Particle Charge

2. Draw your model and be sure to label your diagram with the subatomic particle names to show you where you placed them.

3. Since subatomic particles are matter they have mass. Compare the masses of the subatomic particles. Where is the majority of an atom’s mass located?

1. The first model of the atom was developed by JJ Thomson in 1904, who thought that atoms were composed purely of negatively charged electrons. This model was known as the 'plum pudding' model.

This theory was then disproved by Ernest Rutherford and the gold foil experiment in 1911, where Rutherford shot alpha particles at gold foil, and noticed that some went through and some bounced back, implying the existence of a positive nucleus.

In 1913, Niels Bohr proposed a model of the atom where the electrons were contained within quantized shells that orbited the nucleus. This was because it was impossible for the cloud of negative electrons proposed by Rutherford to exist, as the negative electrons would be drawn to the positive nucleus, and the atom would collapse in on itself.

In 1926, the Austrian physicist Erwin Schrödinger created a quantum mechanical model of the atom by combining the equations for the behavior of waves with the de Broglie equation to generate a mathematical model for the distribution of electrons in an atom.

However the model used today is closest to the Bohr model of the atom, using the quantized shells to contain the electrons.

2. Joseph Priestly, Antoine Lavoisier, and others set the stage for the foundation of chemistry. They demonstrated that substances could combine to form new materials. It was the English chemist, John Dalton, who put the pieces of the puzzle together and developed an atomic theory in 1803.

3.  No because it was believed that the atom was the smallest part that could ever be possible. But with the recent discoveries of large number of subatomic particles, this does not hold true.

Explanation:

Sorry I could only do part 1.

Using the subtraction property of equality, 80 − 20 = 60, so m∠DBC = 60°.

Step-by-step explanation:

hope this is helps you