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Assertion: Boron has a smaller first ionisation enthalpy than beryllium.
Reason: The penetration of a electron to the nucleus is more than the electron, hence electorn is more shielded by the inner core of electrons than the 2s electrons.
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Question 1
The first and the second ionization enthalpies (in kJ mol) and the electron gain enthalpy (in kJ mol) of a few elements are given below:Which of the above elements is likely to be :
(a) the least reactive element,
(b) the most reactive metal,
(c) the most reactive non-metal,
(d) the least reactive non-metal,
(e) the metal which can form a stable binary halide of the formula MX (X=halogen) and
(f) the metal which can form a predominantly stable covalent halide of the formula MX (X=halogen)?
Question 2
A compound of vanadium has a magnetic moment of . Work out the electronic configuration of vanadium in the compound Question 3
Which of the following statements related to the modern periodic table is incorrect?(a) The p-block has 6 columns because a maximum of 6 electrons can occupy all
the orbitals in a p-shell
(b) The d-block has 8 columns because a maximum of 8 electrons can occupy all the orbitals in a d-subshell
(c) Each block contains a number of columns equal to the number of electrons that can occupy that subshell
(d) The block indicates value of azimuthal quantum number (I) for the last subshell that received electrons in building up the electronic configuration
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| Question Text | Assertion: Boron has a smaller first ionisation enthalpy than beryllium. Reason: The penetration of a electron to the nucleus is more than the electron, hence electorn is more shielded by the inner core of electrons than the 2s electrons. |
| Answer Type | Video solution: 1 |
| Upvotes | 151 |
