Characteristics of the groups and periods in the modern periodic table are because of the ……… of the elements.
1. Atomic Mass
2. valence electrons
3. electronic configuration
4. atomic radius
Answers
Answer:
correct answer is '2' valence electrons.
Explanation:
A valence electron is an electron in the outer shell associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.
Answer:
The horizontal rows in the periodic table are known as periods. The vertical columns in the periodic table are known as groups. The number of periods and groups present in the periodic table are 7 and 18 respectively.
Explanation:
The characteristics of the groups and periods in the modern periodic table are because of the valence electrons of the elements.
In a single covalent bond, both atoms in the bond each contribute one valence electron to form a shared pair.
A valence electron is an electron in an atom's outer shell that can participate in the formation of a chemical bond if the outer shell is open.
Atomic mass is the mass of an atom in a particular compound.
The electronic configuration is the distribution of electrons in the different shells of an element.
The atomic radius of an element is the distance from the nucleus of an element to the outermost valence electron shell.
Hence, the correct option is (2) valence electrons.
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