# Short-Questions

Fast solutions for complex problems

25

## How did Rutherford know the nucleus was positively charged?

Alpha particles were scattered in many directions. 5. How did he know that the nucleus was positively charged? He knew the nucleus was positively charged because the positively charged alpha particles were bouncing back rather than becoming stuck to the nucleus.

## What led to the discovery of positively charged particles?

Using a cathode ray tube with holes in the cathode, he noticed that there were rays traveling in the opposite direction from the cathode rays. He called these canal rays and showed that they were composed of positively charged particles.

How did JJ Thomson know that there was something positive in the atom?

In 1897, J.J. Thomson discovered the electron by experimenting with a Crookes, or cathode ray, tube. He demonstrated that cathode rays were negatively charged. In addition, he also studied positively charged particles in neon gas.

What did the discovery of the electron prove?

With both magnetic and electric deflections observed, it was clear that cathode rays were negatively charged particles. Thomson’s discovery established the particulate nature of electricity. Thus, the electron was the first subatomic particle identified, the smallest and the fastest bit of matter known at the time.

### Who discovered the electron?

J.J. Thomson
Although J.J. Thomson is credited with the discovery of the electron on the basis of his experiments with cathode rays in 1897, various physicists, including William Crookes, Arthur Schuster, Philipp Lenard, and others, who had also conducted cathode ray experiments claimed that they deserved the credit.

### What did the Rutherford experiment prove?

Rutherford’s experiment showed the existence of a nuclear atom – a small, positively-charged nucleus surrounded by empty space and then a layer of electrons to form the outside of the atom. Most of the alpha particles did pass straight through the foil. The atom being mostly empty space.

Who named electron?

G. Johnstone Stoney
he word “electron,” coined by G. Johnstone Stoney in 1891, had been used to denote the unit of charge found in experiments that passed electric current through chemicals. In this sense the term was used by Joseph Larmor, J.J. Thomson’s Cambridge classmate.

What was Goldstein experiment?

What did Goldstein discover about the atom? Eugene Goldstein discovered positive particles by using a tube filled with hydrogen gas (this tube was similar to Thomson’s tube). This resulted in The positive particle had a charge equal and opposite to the electron. The positive particle was named the proton.

#### What was Rutherford’s model called?

Rutherford atomic model
Rutherford model, also called Rutherford atomic model, nuclear atom, or planetary model of the atom, description of the structure of atoms proposed (1911) by the New Zealand-born physicist Ernest Rutherford.

#### What was Rutherford’s experiment?

Ernest Rutherford’s most famous experiment is the gold foil experiment. A beam of alpha particles was aimed at a piece of gold foil. Most alpha particles passed through the foil, but a few were scattered backward. This showed that most of the atom is empty space surrounding a tiny nucleus.

Can electrons be created?

An electron can never be created on its own. Or it takes its charge from other particles, or a positron is created at the same time. Likewise, an electron can’t be destroyed without another equally, but oppositely, charged particle being created. When the electron is isolated, it can never be destroyed.

What is inside an electron?

“The photon inside the electron is the charge, is the electric field inside a volume equivalent with the electric field created by an electric charge! An electric field surrounds an electric charge; the same thing inside the electron, the electric field of the photon surrounds the center of the electron.

## Why was the discovery of electrons so important?

The existence of the electron showed that the 2,000-year-old conception of the atom as a homogeneous particle was wrong and that in fact the atom has a complex structure. Cathode-ray studies began in 1854 when Heinrich Geissler, a glassblower and technical assistant to German physicist Julius Plücker, improved the vacuum tube.

## When did J J Thomson discover the electron?

Their work culminated in the discovery by English physicist J.J. Thomson of the electron in 1897. The existence of the electron showed that the 2,000-year-old conception of the atom as a homogeneous particle was wrong and that in fact the atom has a complex structure.

How did alchemists contribute to the discovery of atoms?

The atom is a basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons. Scattered knowledge discovered by alchemists over the Middle Ages contributed to the discovery of atoms.

How are electrons bound to the nucleus of an atom?

The atomic nucleus contains a mix of positively charged protons and electrically neutral neutrons (except in the case of hydrogen-1, which is the only stable nuclide with no neutrons). The electrons of an atom are bound to the nucleus by the electromagnetic force.