How many s – block and p block elements are there in the third period of the periodic table ?
A) 2, 8
B) 8, 2
C) 4,4
D) 2, 6
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In the periodic table, vertical columns of elements are called _______ and horizontal rows of elements are called _______.
Correct Answer - groups, periods
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The elements present in 2nd period of long form of periodic table :
Correct option is B) 8
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The elements a, b, c, d have the following electron configurations. Then the elements that belong to the same group of periodic table is
Correct option is A) a, b
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Give reason: First period in the modern periodic table contains only two elements.
Elements present in the first period i.e., H and He contain only one shell which is also their valence shell and can accommodate maximum two electrons. As first shell can accommodate only...
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Write names and electronic configurations of elements of first period in the modern periodic table. Identify which of them has the stable complete
Hydrogen (H) : 1s2, Helium (He) : 2s2 Since helium has a complete duplet i.e., two electrons in its valence shell, it has the stable complete electronic configuration.
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Explain how does the filling of electrons takes place in the modern periodic table across: i. Second period ii. Third period
i. Filling of electrons in the second period: In the second period, electrons are filled in the second shell i.e., n = 2. This shell can accommodate a maximum of eight electrons...
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There are 18 elements in the fourth period of the modern periodic table. Explain.
The fourth period corresponds to the filling of fourth shell, n = 4. Therefore, it begins with filling of 4s subshell. The first two elements of the fourth period are K...
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There are total 10 groups in the d-block of the modern periodic table. Explain.
The d-block in the modem periodic table is formed as a result of filling the last electron in d orbital. As there are five orbitals in a d subshell, 10 electrons...
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i. Shortest period in the modern periodic table. ii. Block which is placed separately at the bottom of the modern periodic table.
i. First period ii. f-Block
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Outer electronic configurations of a few elements are given below. Explain them and identify the period, group and block in the periodic
i. 2He: 1s2 Here, n = 1. Therefore, 2He belongs to the 1st period. The shell n = 1 has only one subshell, namely 1s. The outer electronic configuration 1s2 of ‘He’ corresponds to the...
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