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प्रश्न
From the symbol `""_2^4"He"` for the element helium, write down the mass number and the atomic number of the element.
उत्तर
Atomic number = 2
Mass number = 4
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संबंधित प्रश्न
What are the atomic numbers of elements whose outermost electrons is represented by 2p3.
WRITE SHORT ANSWER
Define the atomic mass number of an atom.
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
Do isotopes have the same atomic number or the same mass number?
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Silicon [At. no. = 14, Mass no. = 28]
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Isotopes of hydrogen [11H, 21H, 31H]
What is atomic number?
What is the relation between mass number & atomic number?
In which one of the following, the number of protons is greater than the number of neutrons but number of protons is less than the number of electrons?
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.
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
The atomic number of boron is 5. Write the chemical formula of the compound formed when boron reacts with chlorine.
