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प्रश्न
Multiple Choice Questions
The sum of number of protons and number of neutrons present in the nucleus of an atom is called its
पर्याय
mass number
atomic number
number of electrons
all of the above
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उत्तर
mass number
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संबंधित प्रश्न
What are the atomic numbers of elements whose outermost electrons is represented by 3p5?
In Milikan’s experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge on the oil drop is - 1.282 × 10-18C, calculate the number of electrons present on it.
Multiple Choice Questions
The sub atomic particle with negative charge is
What is variable valency? Name two elements having variable valency and state their valencies.
From the symbol `""_15^31"P"`, state :
(i) mass number of phosphorus,
(ii) atomic number of phosphorus, and
(iii) electron configuration of phosphorus.
From the symbol `""_2^4"He"` for the element helium, write down the mass number and the atomic number of the element.
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
If an isotope of ‘H’ has mass no. = 3, how many neutrons does it have.
The elementary particles such as protons and neutrons are collectively called ______.
State the term for the following:
The amount of substance which contains the same number of units as the number of atoms in carbon-12.
Element ‘P' has electronic configuration 2,8,8,1. The number of chlorine atoms present in the chloride of ‘P’ is ______.
