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प्रश्न
Define the term atomic number.
Define atomic number of an element.
Define the term ‘atomic number’ of an atom.
Define the following form:
Atomic number
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उत्तर १
The number of protons in the nucleus is known as the atomic number of the element and is denoted by Z.
उत्तर २
The number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table. Atomic number is also equal to the number of electrons in an atom.
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संबंधित प्रश्न
Name the three constituents of an atom and state their mass and charge of each. How are they distributed in an atom?
Define the term mass number.
Name the particles that constitute the cathode rays. State some properties of cathode rays.
A nucleus \[\ce{^194_82X}\] emits an alpha particle
- What will be the atomic number of the daughter nucleus Y?
- What will be the number of neutrons in the daughter nucleus Y?
- Write a nuclear reaction showing the emission of this particle.
Let R1 be the radius of the second stationary orbit and R2 be the radius of the fourth stationary orbit of an electron in Bohr's model, The ratio \[\frac{R_1}{R_2}\] is:
Let T1 and T2 be the energy of an electron in the first and second excited states of hydrogen atom, respectively. According to the Bohr’s model of an atom, the ratio T1: T2 is:
A nucleus of mass number of 189 splits into two nuclei having mass number 125 and 64. The ratio of radius of two daughter nuclei respectively is:
Existence of positively charged nucleus was established by:
If the mass number of a nucleus is doubled, its radius becomes:
