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प्रश्न
ÅIn group I of the periodic table, three elements X, Y, and Z have ionic radii 1.33 Å, 0.95 Å and 0.60 Å respectively. Giving a reason, arrange them in the order of increasing atomic number in the group.
उत्तर
As we move down a group, the number of shells increases, and hence the atomic size increases. Therefore, Z will have the smallest atomic number followed by Y, while X will have the largest atomic number. So the elements in order of increasing atomic number will be Z < Y < X.
संबंधित प्रश्न
Explain the Atomic number with example.
Fill in the following blanks :
| Atomic Number | Mass Number | Protons | Neutrons | Electrons | Symbol |
| 10 | 22 | _________ | _________ | _________ | _________ |
Sulphur has an atomic number 16 and a mass of 32.
State the number of protons and neutrons in the nucleus of sulphur. Give a simple diagram to show the arrangement of electrons in an atom of sulphur.
From the symbol `""_2^4"He"` for the element helium, write down the mass number and the atomic number of the element.
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?
Define the term of atomic number.
Explain the following terms.
- Proton
- Electron
- Neutron.
The Atomic number of an element is 20. It has ______ valence electrons.
Mass No. 27 is for the element ______.
In a neutral atom number of protons is equal to the number of neutrons.
