What is the valency of silicon Why?

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Valency: (adsbygoogle = window.adsbygoogle || []).push({}); The combining capacity of the atom of an element is called its valency.It is always a whole number.Valency varies from 1 to 8.Valency is always positive.An element with a valency is one called monovalent, with two called divalent.The valency of noble gases is zero.Valency of Silicon:The atomic number of silicon is 14.The electronic configuration of the silicon is 1s22s22p63s23p2.Valency = 8 - valence shell electron.In a silicon atom, the outermost orbital contains 4 electrons, therefore its valency is 4. Valency of Oxygen:The atomic number of oxygen is 8.The electronic configuration of oxygen is 1s22s22p4.In an oxygen atom, the outermost orbital contains 6 electrons.If an element contains more than 4 electrons in its outermost shell then the valency of an element can be calculated as:Valency = 8 - valence shell electron.Therefore, the valency of the oxygen atom is 8-6=2.
What is valency Class 9 answer?
Why manganese valency is 4?
Why it is called valency?

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Hint: Valency of every element is related to their group number of the periodic table. Also, Carbon and Silicon atoms both have the same valency.Complete answer:
1. First of all, the definition of Valency is “The combining capacity of an atom is known as its valency. The number of bonds that an atom can form as part of a compound is expressed by the valency of the element”
2. In more simple terms, we can say that valence electrons are those electrons which are present in the outermost orbital of the atom.
3. We can calculate the valency in the flowing way. An atom’s valence is equal to the number of electrons in the outer shell when that number is four or fewer. Then the valence in the outer shell is equal to eight minus the number of electrons. Once we are aware of the number of electrons we can calculate the valence easily.
4. We can take an example, for instance, Oxygen has six valence electrons and therefore, the valency of oxygen atom is 8-6=2
5. Therefore, Silicon has 4 outermost electrons in its valence shell which is less than 8. Therefore, the valency of silicon atoms is 4.

Additional information:
Valency is different from the oxidation number. Thus, the valency of nitrogen is 3, whereas it can have oxidation numbers from -3 to +5. The oxidation number is the hypothetical charge of an atom in a molecule or ion, and it is a measure of its apparent capacity to gain or lose electrons within that species. The importance of valency is that when two atoms react, their outer shell first comes into contact and it is therefore the outer shell electron that is normally involved in chemical reaction. The atoms exchange valence electrons in chemical reaction to stabilize their valence shell.

Note: It should be noted that loss of electron or electron gain called atom charge, Positive charge will be attained by donating an electron and negative charge vice versa. So valence has no sign, Charge has both positive and negative signs.

Answer

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Hint: Atom’s chemical properties depend on the atomic number. The valency of an element depends upon the total number of electrons in the outermost shell of an atom. Valence electrons are the electrons that are present in the outermost shell of an atom.

Complete step by step answer:
Silicon is a chemical element found in the periodic table which has the symbol Si with an atomic number 14. The atomic structure of silicon makes it an extremely important semiconductor. The atoms in silicon are held in fixed positions by strong forces and only have limited movement.
The valency is determined by the number of valence electrons present in the atom of that element.
Silicon has 4 electrons in the outermost shell. Hence, the valency of silicon atoms is 4.

Thus, the correct answer is option A. i.e., 4.
Additional Information:
Electronic configuration of Silicon is 2, 8, 4. Thus to complete its octet it either needs to lose 4 electrons or gain 4 electrons. Normally it does not do it because this requires a high amount of energy. But it does have the ability to show +4 or -4 valency. To complete the octet, it can share its 4 electrons, hence its valency is 4.

Note:
Silicon is a hard, brittle crystalline solid with a blue-grey metallic lustre, and is a tetravalent metalloid and semiconductor. In the periodic table, it is a member of group fourteen. Each silicon atom consists of two oxygen atoms. Carbon is present above the silicon atom and germanium; tin and lead are present below it.

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Solution

Valency: (adsbygoogle = window.adsbygoogle || []).push({}); The combining capacity of the atom of an element is called its valency.It is always a whole number.Valency varies from 1 to 8.Valency is always positive.An element with a valency is one called monovalent, with two called divalent.The valency of noble gases is zero.Valency of Silicon:The atomic number of silicon is 14.The electronic configuration of the silicon is 1s22s22p63s23p2.Valency = 8 - valence shell electron.In a silicon atom, the outermost orbital contains 4 electrons, therefore its valency is 4. Valency of Oxygen:The atomic number of oxygen is 8.The electronic configuration of oxygen is 1s22s22p4.In an oxygen atom, the outermost orbital contains 6 electrons.If an element contains more than 4 electrons in its outermost shell then the valency of an element can be calculated as:Valency = 8 - valence shell electron.Therefore, the valency of the oxygen atom is 8-6=2.

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What is valency Class 9 answer?

Valency is simply equal to the number of electrons gained, lost or shared by an atom of an element to achieve the nearest noble gas configuration. For example, the valency of sodium (Na) is 1, magnesium (Mg) is 2, Chlorine (Cl) is 1 etc.

Why manganese valency is 4?

Due to its different electronic configurations this element shows variable valency. Sometimes an atom of element can lose more electrons than present in its valence shell. Therefore the valency of Mn is $ +4 $ in $ \text{Mn}{{\text{O}}_{2}} $ molecule or we can say it is manganese (IV) oxide.

Why it is called valency?

valence, also spelled valency, in chemistry, the property of an element that determines the number of other atoms with which an atom of the element can combine. Introduced in 1868, the term is used to express both the power of combination of an element in general and the numerical value of the power of combination.