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प्रश्न
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element which can form trivalent ion
उत्तर
Atomic number 15
Electronic configuration (15): 2,8,5
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संबंधित प्रश्न
Fill in the blanks- The number of protons in the nucleus of an atom is called its ....................
Fill in the Blank of the Following Statement :
An atom has atomic mass number 23 and atomic number 11. The atom has .................... electrons.
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.
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Lithium [At. no. = 3, Mass no. = 7]
The Atomic number of an element is 20. It has ______ valence electrons.
‘A’ is denoted by ______.
K and L shells can accommodate a maximum of 2 and 8 electrons respectively.
Match the following:
| Column A | Column B | ||
| 1. | K shell | a. | 8 |
| 2. | L shell | b. | 32 |
| 3. | M shell | c. | 2 |
| 4. | N shell | d. | 18 |
If element M has mass number 24 and atomic number 12, how many neutrons does its atom contain?
An element has 2 electrons in its N shell.
What is its atomic number?
