Name: Subatomic Particles
Uploaded: 2019-07-19
Duration: 6 min 2 s
Description: A subatomic particle is a particle of a size smaller than that of an atom. Protons, electrons, and neutrons are examples of these particles.

Question

Solve the following cross-word puzzle.

Across
1. Total number of protons and neutrons
5. Subatomic particles with no charge

7. Positively charged subatomic particles

Down

2. He proposed planetary model

3. These elements have same atomic number but different mass number

4. Charge on anode rays

6. Maximum number of electrons in N shell

8. Charge on cathode rays

Accepted Answer

1. Mass number- The mass number also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. It is approximately equal to the atomic (also known as isotopic) mass of the atom expressed in atomic mass units.

2. Rutherford- Based on the size and mass of the nucleus revealed by his experiment, as well as the mass of electrons, Rutherford proposed the planetary model of the atom. The planetary model of the atom pictures low-mass electrons orbiting a large-mass nucleus.

3. Isotopes- Isotopes are distinct nuclear species (or nuclides, as technical term) of the same chemical element. They have the same atomic number (number of protons in their nuclei) and position in the periodic table (and hence belong to the same chemical element), but differ in nucleon numbers (mass numbers) due to different numbers of neutrons in their nuclei. While all isotopes of a given element have almost the same chemical properties, they have different atomic masses and physical properties.

4. Positive-

The streams of positively charged particles are called anode rays or positive rays or canal rays. Goldstein performed a discharge tube experiment, using perforated cathode. He observed that in addition to cathode rays, a new kind of rays were also found. These rays passed through the hole of the perforated cathode but traveled in a direction opposite to that of cathode rays. These rays were found to consist of positively charged particles and were called anode rays or positive rays or canal rays.

5. Neutrons- Neutrons are subatomic particles that are one of the primary constituents of atomic nuclei. Neutrons do not have any net electric charge associated with them. They are neutral. They do, however, have a mass which is slightly greater in magnitude than that of a proton.

6. Thirty two- In general, the nth shell can hold up to $2 n^{2}$ electrons. The maximum number of electrons in N shell $2 + 6 + 10 + 14 = 32$

7. Protons- Proton is a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.

8. Negative- A cathode ray is a beam of electrons in a vacuum tube traveling from the negatively charged electrode (cathode) at one end to the positively charged electrode (anode) at the other, across a voltage difference between the electrodes. They are also called electron beams.

Important Questions on Atomic Structure

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