Composition of the nucleus, Chemistry

Assignment Help:

Q. Composition of the nucleus

Since the time of Rutherford, other scientists have learned a significant amount about the fundamental properties about the nucleus of an atom. In particular, they were able to discover that the nucleus was composed of fundamental particles called protons and neutron.

The Proton

In an experiment where he used a modified cathode-ray tube, Thompson realized that there were rays traveling in a direction opposite to that of the negative cathode-rays made up of electrons. Thompson showed that these rays were composed of positively-charged particles that have the same amount of electrical charge, but of opposite sign, as electrons. These particles were eventually given the name of protons.

The Neutron

Scientists were confused as they realized that the total mass of the atom was more than just the sum of the masses of the protons and electrons. They suspected that the atom contained a third type of subatomic particle that contributed to the atomic mass.

However, as this particle did not have an electrical charge, and therefore was neutral, it was more difficult to detect that the electron and proton. In 1932, an English scientist named James Chadwick showed that an atom contains a third kind of subatomic particle which he called a neutron. A neutron has about the same mass as a proton and is also found in the nucleus of the atom. However, unlike the proton, the neutron does not have an electric charge.


Related Discussions:- Composition of the nucleus

What are the physical properties of halogens, Q. What are the Physical Prop...

Q. What are the Physical Properties of Halogens? Ans. The halogens exist as  diatomic  molecules held together by a single bond. Reactivity becomes less as you move down

Atomic mass when number of neutrons and electrons alter, Atoms consists of ...

Atoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and two  times  respectively to their actual masses, then the atomic mass of

Bohr''s model, which is the main postulate of bohr''s model of atom

which is the main postulate of bohr''s model of atom

Detemine energy of atomic orbitals, Energy of atomic orbitals in a particul...

Energy of atomic orbitals in a particular shell is in the order: (1) s (2) s> p > d > f        (3) p (4)  f > d > s >p Ans:  s

When a mole of water is formed from h and o atoms, The bond energy of an O-...

The bond energy of an O- H bond is 109 kcal mol 1. When a mole of water is formed from H and O atoms, then 218 kcal is released. Two O-H bonds are there is H2O so 2*109 kcal an

Find the number of degrees of freedom - single phase system, Find the numbe...

Find the number of degrees of freedom? Consider a single-phase system that is a gaseous mixture of N 2 , H 2 , and NH 3 . For each of the following cases, find the number of de

POTENTIOMETRIC TITRATION, WHAT TYPE OF CHEMICAL REACTION IS INVOLVED IN POT...

WHAT TYPE OF CHEMICAL REACTION IS INVOLVED IN POTENTIOMETRIC TITRATION

Elements, list the elements that have all 3 properties: lustre , malleabbil...

list the elements that have all 3 properties: lustre , malleabbility and conductivity

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd