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प्रश्न
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with four shells
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उत्तर
Atomic number 19
Electronic configuration (19): 2,8,8,1
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संबंधित प्रश्न
From the symbol `""_2^4"He"` for the element helium, write down the mass number and the atomic number of the element.
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]
Elements A, B and C have atomic numbers 9, 20 and 10 respectively.
- State which one is
(1) a non-metal,
(2) a metal,
(3) chemically inert.[A,B,C] - Write down the formula of the compound formed by two of the above elements.[BA2]
The particles that make up the atom are called ______ particles.
What is a neutron?
‘A’ is denoted by ______.
In a neutral atom number of protons is equal to the number of neutrons.
Match the following:
| Column A | Column B | ||
| 1. | Mass of proton | a. | +1 |
| 2. | Mass of electron | b. | -1 |
| 3. | Charge of electron | c. | 9.31 x 10-28g |
| 4. | Charge of proton | d. | 1.67 x 10-24g |
If element M has mass number 24 and atomic number 12, how many neutrons does its atom contain?
Compare the charge and mass of protons and electrons.
