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प्रश्न
If number of electrons in an atom is 8 and number of protons is also 8, then
- What is the atomic number of the atom? and
- What is the charge on the atom?
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उत्तर
i. Number of electrons in an atom = Number of protons
The number of electrons in an atom = 8
Charge of an atom = Number of protons − Number of electrons
= 8 − 8
= 0
ii. The number of protons is equal to the number of electrons. So, the atom will be neutral.
संबंधित प्रश्न
What are the atomic numbers of elements whose outermost electrons is represented by 3p5?
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An ion which has a positive charge is called a ..................
FILL IN THE BLANK
Atomic theory of matter was given by ..........................
(a) Which of the nuclear particles is present in the same fixed number in the atoms of any particular element?
(b) What do we call this number which is characteristic of a particular element?
The atom of an element X has 7 electrons in its M shell.
What is the atomic number of element X?
Match the statements in List I with the correct answer from List II.
| List I | List II |
| 1. Mass number of an atom is the number of protons and | A: Electron |
| 2. The sub-atomic particle with a negligible mass. | B: Argon |
| 3. An atom having stable electronic configuration. | C: Nitrogen |
| 4. A molecule formed by sharing of electrons [covalency] | D: Sodium |
| 5. A metallic atom having unstable electronic configuration. | E: Neutrons |
Atomic number : ______ :: Mass number : Number of protons and neutrons.
What is common salt? Name the elements present in it. Write the formula of common salt. What are the atomic number and the mass number of the elements? Write the ions in the compound.
Name the 3 sub-atomic particles of an atom.
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 |
