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An element X belongs to the 3rd period and 1st group of the periodic table. What is the number of valence electrons in its atom?
- a)1
- b)3
- c)6
- d)8
Correct answer is option 'A'. Can you explain this answer?
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An element X belongs to the 3rd period and 1st group of the periodic ...
As the element belongs to the 1st group of the periodic table, so the number of valence electrons in its atom is one.
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An element X belongs to the 3rd period and 1st group of the periodic ...
To determine the number of valence electrons in an element, we need to look at its position in the periodic table.
Periods in the periodic table represent the energy levels or shells of an atom, while groups represent the number of valence electrons. In this case, the element X belongs to the 3rd period and 1st group of the periodic table.
1. The 3rd period:
The 3rd period of the periodic table has a total of 3 energy levels or shells. This means that the element X has 3 energy levels.
2. The 1st group:
The 1st group of the periodic table is also known as the alkali metals group, which includes elements like hydrogen (H), lithium (Li), sodium (Na), and potassium (K). These elements have 1 valence electron because they are in the 1st group.
Since element X belongs to the 1st group, it also has 1 valence electron.
The valence electrons are the electrons in the outermost shell of an atom, and they are responsible for the atom's chemical properties and reactivity. In this case, since element X has only 1 valence electron, it will likely have similar properties and reactivity to other alkali metals in the 1st group.
Therefore, the correct answer is option 'A' - 1 valence electron.
Periods in the periodic table represent the energy levels or shells of an atom, while groups represent the number of valence electrons. In this case, the element X belongs to the 3rd period and 1st group of the periodic table.
1. The 3rd period:
The 3rd period of the periodic table has a total of 3 energy levels or shells. This means that the element X has 3 energy levels.
2. The 1st group:
The 1st group of the periodic table is also known as the alkali metals group, which includes elements like hydrogen (H), lithium (Li), sodium (Na), and potassium (K). These elements have 1 valence electron because they are in the 1st group.
Since element X belongs to the 1st group, it also has 1 valence electron.
The valence electrons are the electrons in the outermost shell of an atom, and they are responsible for the atom's chemical properties and reactivity. In this case, since element X has only 1 valence electron, it will likely have similar properties and reactivity to other alkali metals in the 1st group.
Therefore, the correct answer is option 'A' - 1 valence electron.
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