A hangar is a _____.
2 answers:
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<u>Answer:</u> The correct answer is Option 4: U
<u>Explanation:</u>
Activation energy is defined as the energy that is given to a chemical system with potential reactants to produce products. It is represented as
It is represented as the energy from the reactants to the activated complex.
Reverse reaction is defined as the reaction in which the products formed become reactants and leads to the formation of reactants back.
So, here, the activation energy of the reverse reaction is the energy between the products and the activated complex, which is represented as letter U in the given graph.
Hence, the correct answer is Option 4: U
The period is equal to the number of shells present in an atom.
The group number is equal to the number of valence electrons.
<h3>What is the period in the periodic table?</h3>A period in the periodic table is a row of chemical elements.
The horizontal rows (which Mendeleev called series) are called periods and the vertical columns, are groups.
Elements having similar outer electronic configurations in their atoms are arranged in vertical columns.
The period indicates the value of n for the outermost or valence shell. The period is equal to the number of shells present in an atom. To find a period, the no. of shells =no. of periods.
Example: Na- 2,8,1 - Three shells are there, so period no. is 3.
Calcium - 2,8,8,2 - Four shells are there, so period no. is 4.
To determine the group, we need to understand some rules:
1. If the element is in s block, then the group number is equal to the number of valence electrons.
Example: Mg(12) - 2,8,2
Group = no. of valence electrons = 2
2. If the element is in the p block, then the number of the group can be determined by the formula: (number of valence electrons + 10).for groups.
Example: S(16) - 2,8,6
Group = no. of valence electrons+ 10 = 6+ 10 = 16
3. If the element is in the d block, then the number of the group can be determined by the formula: number of electrons in(n−1)d subshell + (number of electrons in (n)s subshell).
Example: Fe(26):
Group = number of electrons in(n−1)d subshell + (number of electrons in (n)s subshell) = 6+2 = 8
4. If the element is in the f block, then the number of the group is always 3. Example: Cerium (58) belongs to the 3rd group.
Learn more about the period in the periodic table:
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