particles are formed by the grains of electrons by atom
Answers
Answer:The proton is a positive charged particle an electron is a negatively charged particle and a neutron has no charge
The neutron has a similar mass to the proton and electron mass = 1/1836 x the mass of the proton
The element atomic number is the number of protons in the nucleus of an atom and defines its chemical properties
The mass number of an atom is the total number of protons + neutrons in an atom.
The relative atomic mass of an element is the mass measured in comparison with carbon-12 which has a Relative Atomic mass of 12
A neutral atom has an equal number of protons and electrons
The chemical properties of an atom are not affected by the number of neutrons.
Elements of atoms with the same atomic number but different number of neutrons are called isotopes
There are about 115 different elements of which 92 occur naturally
Atoms:Electronic Structure
The electrons of an atom are arranged into a number of shells depending on the Atomic number
Hydrogen has only one Shell (K shell). Uranium has a full quota of shells (K,L,M,O,P and Q)
These shells have associated Quantum numbers (K = 1, L = 2, M = 3, N = 4, O = 5, P = 6, Q = 7)
Within the shells electrons can have certain energy levels ( s, p d, f, g h ).
These energy levels have associated Azimuthal quantum numbers s = 0, p = 1, d= 2, d = 3, g = 4, h = 5.
The ability of an element to form compounds is directly related to the population of electrons in these shells
The shorthand notation for iron ( Fe = 1s 22s 2 2p 63s 23p 63d 64s 2 )
Within each shell of an atom the maximum number of electrons at each azimuthal level is as follows;
Shell s p d f g h
K 2
L 2 6
M 2 6 10
N 2 6 10 14
O 2 6 10 14 18
P 2 6 10 14 18 22
The sketch below illustrates the directional nature of the s and p electrons based on the principle of wave mechanics and identifies regions in which electrons are very likely to occur. At the most 2 electrons can be present in any orbital
Element
An element is is a pure substance which cannot be split by chemical means into other substances
Explanation:
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Answer:
When atoms join together it is called a chemical reaction. Atoms are made up of three kinds of smaller particles, called protons (which are positively charged), neutrons (which have no charge) and electrons (which are negatively charged). ... Except for hydrogen, the nucleus also has neutrons.
Explanation: