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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
The composition of the nuclei of two atomic species X and Y are given as under
| X | Y | |
| Protons | 6 | 6 |
| Neutrons | 6 | 8 |
Give the mass numbers of X and Y. What is the relation between the two species?
Give reason
Actual atomic mass is greater than mass number.
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with 6 valence electrons
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Argon – \[\ce{^40_18Ar}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
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.
What is a neutron?
If an atom has 6 electrons in its outermost shell, it is inert.
Compare the charge and mass of protons and electrons.
Ca2+ has completely filled outer shell. Justify your answer.
Element ‘P' has electronic configuration 2,8,8,1. The number of chlorine atoms present in the chloride of ‘P’ is ______.
