The longest period in the modern periodic table is
A) 7th
B) 6th
C) 5th
D) 4th
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In modern periodic table, the period number indicates the :
Option : c. principal quantum number
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Modern periodic law states that the properties of elements are periodic functions of their
D) both B and C
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As per modern periodic law, the properties of the elements are periodic functions of their
C) atomic numbers
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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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Why does the fifth period of the modern periodic table contain 18 electrons?
The fifth period accommodates 18 elements as a result of successive filling of electrons in the 5s, 4d and 5p subshells.
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What is the general trend followed while filling of electrons across a period in the modern periodic table.
A period begins by filling of one electron to the ‘s’ subshell of a new shell and ends when an element corresponding to the same shell attains complete octet (or...
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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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