According to IUPAC recommondations, the number of groups in the long form of the periodic table is :-
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How many elements are placed in lanthanide and actinide series?
Which of the following elements of noble gases participate in chemical reaction?
In the modern periodic table which are the metals among the first 10 elements?
Nitrogen and phosphorus belong to the group 15 of the periodic table. Which of these will be more electronegative?
The second ionization energy is greater than the first because
The atomic number of an element is 16 predict the nature of the element
When metals react with non-metals, electrons are transferred from the metal atoms to the non-metal atoms, forming ions. The resulting compound is called_____
Which set of elements is listed in order of increasing ionization energy?
Which of the following element forms dipositive ion very easily?
Which of the following is not the limitation of Mendeleev’s periodic table?
What is the atomic number of the first element of the lanthanide series?
Statement A : Electron affinity of fluorine is more than that of chlorine.
Statement B : Carbon monoxide is an acidic oxide.
Statement A : energy is always released when a neutral atoms gain an electron
Statement B Tellurium and polonium are semi metals
What is the number of valance electrons in the last element of 3rd period?
Arrange the following elements in the decreasing order of their atomic radii
Elements having same valence electrons are placed in same group but there is an exception with-
P, Q, R are elements of Dobereiner’s triads. If the atomic mass of P is 7 and that of Q is 23, What will be the atomic mass of R?
Which element was discovered after Mendeleev gave the periodic table?
An element with atomic no 3 combines with another elements with atomic number 17, What would be the formulae of the compound?
146 videos|358 docs|249 tests
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146 videos|358 docs|249 tests
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