14. Which of the following scientists discovered the electron? A. Democritus B. Dalton C. Thomson D. Rutherford

Q: How are electrons and protons similar? How are they different?

A:

Q: Describe the Rutherford's α-particle bombardment experiment. Explain the Rutherford Atomic Model…

A: Solution :      Rutherford's atomic model put forward by Ernest Rutherford to explain the atomic…

Q: Which of the following scientists did not contributeto determining the structure of the atom?(a)…

A: To find: The scientists did not contribute to determining the structure of the atom

Q: How and by whom was the electron discovered?

A: The electron was discovered by an English physicist J.J Thomson.  J.J Thomsom performed a…

Q: Complete the following by placing the missing words correctly. The atomic theory was given by +.…

A: The answer to the following question-

Q: what was johns dalton initial research focus was and what he eventually contributed to early atomic…

A: Johns dalton first introduced atomic theory in chemistry.He gave three laws.These are i-Law of…

Q: What was Thomson's cathode ray experiment?

A: Sir J.J Thomson's cathode ray experiment led to the discovery of the electron. This was one of the…

Q: On a sheet of paper, Illustrate the history of the atom. Indicate the scientist's name, the Time…

A:

Q: + а. Bohr b. Dalton C. Rutherford d. Thomson 3. Which atomic model was the first to show a nucleus,…

A: 27) in the Given figure, the model of an atom was proposed by Thomson.

Q: John Dalton was an English scientist who lived from 1766 to 1844. Dalton's significant contributions…

A: Dalton put forward the theory of matter. It is the oldest theory that explains the nature of matter.…

Q: Go Figure What is the charge on the particles that form the beam? Will they beattracted to or…

A: Basic unit of matter is atom. Study of atom was done by many scientists. Each scientist made some…

Q: 5. List the three subatomic particles and their properties.

A: To find: The list of three subatomic particles and their properties.

Q: i) Ernest Rutherford discovered a. proton b. electron ...................by thin gold foil…

A:

Q: Table 1. Mass # # protons (9.) # neutrons # electrons Symbol 55 (10.) (11.) Co 40 19 (12.) (13.)…

A: Given, Mass of three atoms are provided     Required,                          Number of protons ,…

Q: Briefly explain how Rutherford discovered the nucleus.

A:

Q: Directions: Use the clues to fill in the words. Words can go across or down. Letters are shared when…

A: ACROSS  2. Nucleus 5. Gold  6. Rutherford

Q: Why did J.J. Thompson experiments with cathode ray tubes imply about the mass of an electron…

A:

Q: 9. What observations in the gold foil experiment made Rutherford conclude that atoms are mostly…

A: 9. The answer is option no. (B) Most alpha particles passed through the gold foil undeflected. 10.…

Q: Rutherford's gold foil experiment determined that A) neutrons are in the nucleus. B) electrons have…

A: Rutherford bombarded the alpha particles on the very small sheet of gold. He observed that most of…

Q: Was Democritus’s proposal of the existence of atoms based on scientific methods or ideas? Explain

A:

Q: In the Rutherford Gold Foil Experiment, why did Rutherford expect the alpha particles to pass…

A: Based on Thomson's plum pudding model, Rutherford predicted that most of α particles would pass…

Q: The nucleus of an atom accounts for most of the size and mass of the atom. O very little of the size…

A: According to Dalton's atomic theory, compound is formed by combining elements and it's also based on…

Q: Which scientist developed the "plum pudding" model of the atom? Spherical cloud ´of positive charge…

A: J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively…

Q: Which scientist developed a model that is still used today to show the number of electrons in each…

A: Bohr model explains an atom as a small and positively charged nucleus surrounded by electrons. These…

Q: A selection of the most prominent individuals mentioned in this topic is given below. Match Column A…

A: In one column , there is different names of Scientists.  On the other column, there is some of the…

Q: Who performed this experiment? Robert Millikan O Niels Bohr O J. J. Thomson Ernest Rutherford What…

A: Step : 1              the answers for the following multiple choice questions are as follow :

Q: accomplishments

A:

Q: What did John Dalton proposed about the atom?

A: John Dalton atomic model is a postulate that has no experimental basis.

Q: Describe cathode ray tube experiment and draw its diagram

A:

Q: Which information did Millikan contribute to the understanding of electrons?   A:He determined that…

A: Millikan's Oil Drop experiment - The oil drop experiment was performed by Robert A. Millikan and in…

Q: What did Rutherford conclude about the atom that would explain the unexpected result explain

A: Rutherford performed the α-particle scattering experiment and observed that most of the α- particles…

Q: 6. Who discovered the nucleus of the atom? A. Dalton B. Rutherford C. Millikan D. Thomson

A: Since you have asked multiple questions, we will answer the first one for you. Kindly post the…

Q: Which of the following statements regarding the Rutherford Gold Foil experiment is false? a. The…

A:

Q: Explain Rutherford’s Gold Foil experiment and what it did for the development of the atomic model.

A: Rutherford’s Gold Foil experiment makes out to find out the how an atom is formed and which nuclear…

Q: What discoveries were made by J.J thompson and Lord rutherford? How did Daltons model of the atom…

A: J.J. Thomson experiment: - J. J. Thomson's cathode rays experiment leads to the conclusion that…

Q: why Rutherford's model of an atom was considered to be unstable?

A: Rutherford’s experiment:Rutherford suggested that there is something at the center of the metal…

Q: When was the first theory about the character of the atom developed? O a. some 100 years ago O b.…

A: Atomic theory is a scientific theory of the nature of matter, which states that matter is composed…

Q: 1. Which scientist discovered the quantized nature of electrons? а. Bohr d. Planck b. Dalton e.…

A: Electron has quantized nature.

Q: er scientists knew that atoms contained charged subatomic pa the masses of the particles are…

A: using the mass data expressed in grams in the table calculate how many times more massive a proton…

Q: involving alpha particles and gold foil that led to the discovery of the nucleus in atoms. The…

A: During Rutherford's experiment, most of the α particles emitted from a radioactive source bounced…

Q: proposed

A: Democritus theory is Ancient theory, He say about that matter consists of atom means smallest…

Q: Outline Rutherford’s Gold foil experiment, including the observations and conclusions from his…

A: The arrangement of electrons, protons and neutrons inside the atoms is explained by different atomic…

Q: Summarize the history of the atomic idea. How was Dalton able to convince others to accept an idea…

A:

Q: Which of the following experiments helped to support Dalton’s atomic theory? A)Thomson’s cathode…

A: Dalton's Atomic Theory 1) All matter is made of atoms. They are indivisible and indestructible. 2)…

Q: Which part of John Dalton’s theory was disproved by J.J. Thomson’s cathode-ray tube experiments?…

A: To find: Which part of John Dalton’s theory was disproved by J.J. Thomson’s cathode-ray tube…

Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.