The particles responsible for giving off colored light would be the electrons because the excitement caused by heating makes the electrons jump from ground state into a high energy level. why do you think the chemicals have to be heated in the flame before the colored light is emitted? Light carries away energy.

A:Colorful light emissions are observed in everyday life such as firework shows. In fireworks shows they use different chemicals to produce the different colors. Also, in sunrises and sunsets, rainbows, and shooting stars. Yes, all of these substances have electrons that emit light when excited.

In physics, emission is the process by which a higher energy quantum mechanical state of a particle becomes converted to a lower one through the emission of a photon, resulting in the production of light. The frequency of light emitted is a function of the energy of the transition.

Why do you think the chemicals have to be heated in the flame first before the colored light is emitted? The heat gives the electrons energy moving them to the excited state, then you take the heat off, snapping the electrons back to ground state, releasing the energy that was absorbed causing light to be emitted.

ALL excited electrons give off energy when they return to their ground state from an excited state. Why don’t all heated substances give off colored light? Sodium ions give off a yellow/orange colored flame when heated.

When the electrons return to lower energy levels, they emit energy in the form of light. The colour of the light depends on the difference in energy between the two levels. Every element has a different number of electrons and a different set of energy levels. Thus, each element emits its own set of colours.

violet

red

In the Bohr model of the atom, electrons travel in defined circular orbits around the nucleus. The orbits are labeled by an integer, the quantum number n. Electrons can jump from one orbit to another by emitting or absorbing energy.

Bohr’s model of the hydrogen atom is based on three postulates: (1) an electron moves around the nucleus in a circular orbit, (2) an electron’s angular momentum in the orbit is quantized, and (3) the change in an electron’s energy as it makes a quantum jump from one orbit to another is always accompanied by the …

The Bohr model can be summarized by the following four principles: Electrons occupy only certain orbits around the nucleus. Those orbits are stable and are called “stationary” orbits. Each orbit has an energy associated with it.

Main Points of the Bohr Model

• Electrons orbit the nucleus in orbits that have a set size and energy.
• The energy of the orbit is related to its size. The lowest energy is found in the smallest orbit.
• Radiation is absorbed or emitted when an electron moves from one orbit to another.

According to doctor Bohr model revolving electrons in an atom does not emit or absorb energy continuously and cannot fall into the nucleus. So an atom should exist and nor destroyed until any of the external factor (force) act on it. This is how Doctor Bohr prove that an atom should exist.

Dalton’s atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.

The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons. Dalton also claimed that atoms of different elements are different in all respects. This has been proven wrong in certain cases: argon and calcium atoms each have an atomic mass of 40 amu.

Why is Dalton credited with proposing the first atomic theory if Democritus was talking about atoms almost 2,200 years earlier? – Dalton’s theory was the first scientific theory because it relied on scientific investigative processes. – Dalton used creativity to modify Proust’s experiment and interpret the results.

John Dalton is the chemist who developed the modern atomic theory. His atomic theory is centered on five main principles: atoms, elements, chemical compounds, and chemical reactions.

Manchester, United Kingdom

Although a schoolteacher, a meteorologist, and an expert on color blindness, John Dalton is best known for his pioneering theory of atomism. He also developed methods to calculate atomic weights and structures and formulated the law of partial pressures.