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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 :
विकल्प
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
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?
Multiple Choice Questions
The sub atomic particle with negative charge is
Fill in the blank of the following statement :
The total number of protons and neutrons in the nucleus of an atom is called its _________.
What is meant by the 'atomic number of an element'?
If an atom ‘A’ has mass number 35 and atomic number 17, state the number of protons, electrons and neutrons it contains.
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]
What is mass number of an atom?
What is the relation between mass number & atomic number?
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.
An element has 2 electrons in its N shell.
What is its atomic number?
