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प्रश्न
The atomic number of four elements A, B, C and D are 12, 13, 15 and 3 respectively. The element which cannot form a cation is :
पर्याय
A
B
C
D
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उत्तर
C
Element C has 15 electrons; so, the electronic configuration is 2 , 8 , 5. This element will gain 3 electrons in order to complete its octet; so, it cannot form cations.
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संबंधित प्रश्न
Explain the Atomic number with example.
Fill in the blanks.
Isotopes are the atoms of ______ element having the ______ atomic number but ______ mass number.
From the symbol `""_15^31"P"`, state :
(i) mass number of phosphorus,
(ii) atomic number of phosphorus, and
(iii) electron configuration 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?
Name or state the following:
Elements having same mass number but different atomic number
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Phosphorus – \[\ce{^31_15P}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
Every atom has an equal number of protons and electrons. The nature of the atom is ______.
Mass No. 27 is for the element ______.
K and L shells can accommodate a maximum of 2 and 8 electrons respectively.
State the term for the following:
The amount of substance which contains the same number of units as the number of atoms in carbon-12.
