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Answer:
the combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with.
The Modern Periodic Law states that the chemical and physical properties of elements are periodic functions of their atomic numbers i.e. if elements are arranged in the order of their increasing atomic number, the elements with similar properties are repeated after certain regular intervals.
The distribution of electrons in an atom is called as Electronic Configuration. Formula 2n2 helps in the determination of the maximum number of electrons present in an orbit, here n= orbit number. ... The different energy levels are known as 1, 2, 3, 4….. and the corresponding shells are known as K, L, M, N and so on.
118 elements
The elements of the periodic table sorted by atomic number. click on any elements name for further chemical properties, environmental data or health effects. This list contains the 118 elements of chemistry.
In general, atomic radius decreases across a period and increases down a group. ... Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital. This results in a larger atomic radius
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Answer:
1. 118 elements are present today
2.The Modern Periodic Law states that the chemical and physical properties of elements are periodic functions of their atomic numbers
3.the distribution of electrons of an atom or molecule in atomic or molecular orbitals.
4.In general, atomic radius decreases across a period and increases down a group
5.Valency is the combining power of an elmnt
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