The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.
Q. What is the number of electrons equal to?
The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).
Table of Contents
- Q. What is the number of electrons equal to?
- Q. Why is the number of protons equal to the number of electrons?
- Q. Why is proton so named?
- Q. What is a proton simple definition?
- Q. What is the usual symbol for a neutron?
- Q. What is the usual symbol for an atom?
- Q. What is the symbol of an electron?
- Q. How do you write a complete atomic symbol?
- Q. What has 4 protons and 3 neutrons?
- Q. How do you express an isotope?
- Q. How many electrons are in the 4th Shell?
Q. Why is the number of protons equal to the number of electrons?
When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral.
Q. Why is proton so named?
The word proton is Greek for “first”, and this name was given to the hydrogen nucleus by Ernest Rutherford in 1920. In previous years, Rutherford had discovered that the hydrogen nucleus (known to be the lightest nucleus) could be extracted from the nuclei of nitrogen by atomic collisions.
Q. What is a proton simple definition?
: an elementary particle that is identical with the nucleus of the hydrogen atom, that along with the neutron is a constituent of all other atomic nuclei, that carries a positive charge numerically equal to the charge of an electron, and that has a mass of 1.673 × 10−27 kilogram.
Q. What is the usual symbol for a neutron?
Neutron
| The quark content of the neutron. The color assignment of individual quarks is arbitrary, but all three colors must be present. Forces between quarks are mediated by gluons. | |
|---|---|
| Classification | Baryon |
| Statistics | Fermionic |
| Interactions | Gravity, weak, strong, electromagnetic |
| Symbol | n , n 0 , N 0 |
Q. What is the usual symbol for an atom?
The symbol for an atom indicates the element via its usual two-letter symbol, the mass number as a left superscript, the atomic number as a left subscript (sometimes omitted), and the charge as a right superscript.
Q. What is the symbol of an electron?
Fundamental Subatomic Particles
| Particle | Symbol | Charge |
|---|---|---|
| electron | e- | -1 |
| proton | p+ | +1 |
| neutron | no | 0 |
Q. How do you write a complete atomic symbol?
To write a complete nuclear symbol, the mass number is placed at the upper left (superscript) of the chemical symbol and the atomic number is placed at the lower left (subscript) of the symbol.
Q. What has 4 protons and 3 neutrons?
Lithium
Q. How do you express an isotope?
To write the symbol for an isotope, place the atomic number as a subscript and the mass number (protons plus neutrons) as a superscript to the left of the atomic symbol.
Q. How many electrons are in the 4th Shell?
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| Shell | Subshell | Total Number of Electrons in Shell |
|---|---|---|
| 1st Shell | 1s | 2 |
| 2nd Shell | 2s, 2p | 2 + 6 = 8 |
| 3rd Shell | 3s, 3p, 3d | 2 + 6 + 10 = 18 |
| 4th Shell | 4s, 4p, 4d, 4f | 2 + 6 + 10 + 14 = 32 |
