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प्रश्न
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with 6 valence electrons
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उत्तर
Atomic number 8
Electronic configuration (8): 2,6
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संबंधित प्रश्न
Name the particles which actually determine the mass of an atom.
From the symbol `""_15^31"P"`, state : atomic number of phosphorus
Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Which one:
- Forms an anion
- Forms a cation
- Has four electrons in its valence shell?
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with four shells
State the main postulates of Dalton’s atomic theory.
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Oxygen – \[\ce{^16_8O}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
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 |
Every atom has an equal number of protons and electrons. The nature of the atom is ______.
The No. of electrons in the outermost shell of the atom of an inert gas ______.
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.
