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प्रश्न
Name or state the following:
Elements having same mass number but different atomic number
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उत्तर
4018Ar and 4020Ca
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संबंधित प्रश्न
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Atomic theory of matter was given by ..........................
Tick the most appropriate answer.
Which of these have similar chemical properties but different set of physical properties and mass number?
- isobars
- elements
- isotopes
- none of these
What is the significance of atomic numbers in the modern Periodic Table?
An atom of an element has two electrons in the M shell.
What is the (a) atomic number (b) number of protons in this element?
‘Valency is the number of hydrogen atoms which can combine with [or displace] one atom of the element [or radical] forming a compound’. With reference to the above definition of valency, state the valency of chlorine in hydrogen chloride, giving reasons.
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Carbon [At. no. = 6, Mass no. = 12]
Define the term of atomic number.
Atomic number : ______ :: Mass number : Number of protons and neutrons.
The ratio of the radii of hydrogen atom and its nucleus is ~ 105. Assuming the atom and the nucleus to be spherical,
- what will be the ratio of their sizes?
- If atom is represented by planet earth ‘Re ’ = 6.4 ×106 m, estimate the size of the nucleus.
When an atom gives electrons from its outermost shell, it becomes ______ charged.
