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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
Explain the Atomic number with example.
Explain the Mass number with example.
Fill in the blanks.
Isotopes are the atoms of ______ element having the ______ atomic number but ______ mass number.
Fill in the blank of the following statement :
All the mass of an atom is concentrated in a small region of space called the ___________.
The properties of the elements are a periodic function of their __________.
Sulphur has an atomic number 16 and a mass of 32.
State the number of protons and neutrons in the nucleus of sulphur. Give a simple diagram to show the arrangement of electrons in an atom of sulphur.
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Calcium – \[\ce{^40_20Ca}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
‘A’ is denoted by ______.
‘Z’ is denoted by ______.
In a neutral atom number of protons is equal to the number of neutrons.
