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प्रश्न
Fill in the blanks- The number of protons in the nucleus of an atom is called its ....................
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उत्तर
The number of protons in the nucleus of an atom is called its atomic number.
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संबंधित प्रश्न
The mass number of an element is 23 and it contains 11 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?
What is the significance of atomic numbers in the modern Periodic Table?
Give reason
Actual atomic mass is greater than mass number.
If an atom ‘A’ has mass number 35 and atomic number 17, state the number of protons, electrons and neutrons it contains.
‘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.
From the symbol \[\ce{^4_2He}\] for the element helium, write down the mass number and the atomic number of the element.
The atomic number of an element is 9, it has 10 neutrons. Find the element from the periodic table. What will be its mass number?
What is a neutron?
Ca2+ has completely filled outer shell. Justify your answer.
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.
