Chapter 3 hw – Flashcards

In 1909, Robert Millikan performed an experiment involving tiny, charged drops of oil. The drops were charged because they had picked up extra electrons. Millikan was able to measure the charge on each drop in coulombs. Here is an example of what his data may have looked like. Based on the given data, how many extra electrons did drop C contain? A 3.20times 10^{-19} B 4.80times 10^{-19} C 8.00times 10^{-19} D 9.60times 10^{-19}

Why did different drops have different charges?

What did each of the following scientists contribute to our knowledge of the atom? James Chadwick Michael Faraday Eugen Goldstein J.J Thomson William Crookes Ernest Rutherford

What is radioactivity?

How did the discovery of radioactivity contradict Dalton's atomic theory?

Unstable atomic nuclei decay to form nuclei that are usually more stable. In the process, they emit high-energy particles. These particles, called nuclear radiation, occur in three different forms: alpha (α) particles, beta (β) particles, and gamma (γ) rays. Alpha particles are helium nuclei, with two neutrons and two protons. Beta particles are high-energy electrons. Gamma rays are high-energy photons, a form of electromagnetic radiation just like visible light but of much higher energy. Match each description to a type of radiation.

Rank the following by speed. 1.alpha (α ) particles, 2.beta (β ) particles, and 3.gamma (γ ) rays.

Which is the charge of an alpha particle?

Conclusions from Rutherford's experiment Watch the animation depicting Rutherford's experiment and choose which of the following conclusions are correct. 1. A positive charge is condensed in one location within the atom. 2. A positive charge is spread equally over the atom. 3. The atom is a very compact entity without any empty space. 4. The atom does not have a positive charge. 5. The majority of the space inside the atom is empty space.

The structure of the atom On the basis of Rutherford's experimental observations, which of the following statements predicts the structure of the atom? 1. In an atom, negatively charged electrons are small particles held within a positively charged sphere. 2. In an atom, negatively charged electrons are dispersed in the space surrounding the positively charged nucleus of an atom. 3. In an atom, all of the positive and negative charges are randomly distributed. 4. In an atom, most of the mass and the positive charge are located in a small core within the atom called the nucleus.

Sort each of the items into the appropriate bin. Use the diagram of a neutral lithium atom, shown to the left, for reference.(Figure 1) Drag each item to the appropriate bin.

In Rutherford's model of the atom, where are the protons, the neutrons, and the electrons found?

The following table describes four atoms. Atom A Atom B Atom C Atom D Number of protons 20 21 21 20 Number of neutrons 21 20 21 20 Number of electrons 20 21 21 20

Which two atoms in the table have about the same mass? Atom A Atom B Atom C Atom D Number of protons 17 18 18 17 Number of neutrons 18 17 18 17 Number of electrons 17 18 18 17

How many different isotopes of silver are listed here? (The X does not necessarily represent any specific element.) 108/47 X 108/48 X 110/47 X 107/47 X

How many protons and neutrons are there in a 34 S 16 nucleus? 1. 34 neutrons and 16 protons 2. 18 protons and 16 neutrons 3. 18 neutrons and 16 protons 4. 50 neutrons and 16 protons

What theory uses wave properties to describe the motion of particles at the atomic and subatomic levels? 1. the Dalton model 2. the quantum mechanical model 3. the Bohr model 4. the electrolysis mode