mass of proton is always heavier than
Correct answer: D. Electrons
- A. Neutron
- B. Mass number
- C. Atomic number
- D. Electrons
Explanation
A neutron is another subatomic particle found in the nucleus of an atom. Unlike protons and electrons, neutrons have no electrical charge (neutral). The mass of a neutron is slightly greater than that of a proton. It is also commonly expressed as 1 amu or approximately 1.6749275 x 10^-27 kilograms. The mass number, also known as the atomic mass number or nucleon number, is the total number of protons and neutrons in the nucleus of an atom. It is denoted by the letter 'A'. Since protons and neutrons have similar masses, the mass number is often a whole number. The atomic number, denoted by the letter 'Z', represents the number of protons in the nucleus of an atom. It determines the identity of the atom and is used to classify elements in the periodic table. Each element has a unique atomic number. An electron is a subatomic particle that orbits around the nucleus of an atom in electron shells or energy levels. It carries a negative electrical charge and is significantly lighter compared to a proton. The mass of an electron is approximately 9.10938356 x 10^-31 kilograms, which is about 1/1836th the mass of a proton.
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About Discovery of the Proton
The discovery of the proton follows the study of positive rays, also called canal rays, observed in discharge tubes and later identified as positively charged particles. The work of Goldstein and Rutherford is linked to the proton's charge, relative mass and role in the nuclear model, distinct from the discovery of the electron.
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