Define valency by taking examples of silicon and oxygen.
NCERT Class IX
Sciences - Exemplar Problems
Chapter 4. Structure of the Atom
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417
Valency-Number of protons present in the outermost shell of an atom is known as Valency or The combining power of a element with a atom is also known as Valency.
Taking oxygen as Example-
1.Atomic number of Oxygen is8.
2.Electronic configuration-K=2,L=6.
3.According to the electronic configuration the valency is 6 but it is easy for oxygen to gain 2 protons instead of loosing 6 protons.So, The valency of oxygen is 2.
Taking silicon as example-
1.Atomic number of silicon is 14.
2.Electronic configuration-K=2,L=8,m=4.
3.According to the electronic configuration the valency is +4 or -4 because silicon can either gain 4 electrons or loose 4 electrons because it is a noble gase.
Taking oxygen as Example-
1.Atomic number of Oxygen is8.
2.Electronic configuration-K=2,L=6.
3.According to the electronic configuration the valency is 6 but it is easy for oxygen to gain 2 protons instead of loosing 6 protons.So, The valency of oxygen is 2.
Taking silicon as example-
1.Atomic number of silicon is 14.
2.Electronic configuration-K=2,L=8,m=4.
3.According to the electronic configuration the valency is +4 or -4 because silicon can either gain 4 electrons or loose 4 electrons because it is a noble gase.
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What is valency ?
=> Valency is the combining capacity of an atom with another atom (s) .
This is normally given by the number of Valence electrons or by 8 minus the Valence electrons (Only when the number of Valence electrons is more than 4) .
Valency of first 20 elements is given below.
1) Hydrogen (H) = 1
2) Helium (He) = 0
3) Lithium (Li) = 1
4) Beryllium (Be) = 2
5) Boron (B) = 3
6) Carbon (C) = 4
7) Nitrogen (N) = 3
8) Oxygen (O) = 2
9) Fluorine (F) = 1
10) Neon (Ne) = 0
11) Sodium (Na) = 1
12) Magnesium (Mg) = 2
13) Aluminium (Al) = 3
14) Silicon (Si) = 4
15) Phosphorus (P) = 3, 5
16) Sulphur (S) = 2
17) Chlorine (Cl) = 1
18) Argon (Ar) = 0
19) Potassium (K) = 1
20 ) Calcium (Ca) = 2
#Be Brainly !!
=> Valency is the combining capacity of an atom with another atom (s) .
This is normally given by the number of Valence electrons or by 8 minus the Valence electrons (Only when the number of Valence electrons is more than 4) .
Valency of first 20 elements is given below.
1) Hydrogen (H) = 1
2) Helium (He) = 0
3) Lithium (Li) = 1
4) Beryllium (Be) = 2
5) Boron (B) = 3
6) Carbon (C) = 4
7) Nitrogen (N) = 3
8) Oxygen (O) = 2
9) Fluorine (F) = 1
10) Neon (Ne) = 0
11) Sodium (Na) = 1
12) Magnesium (Mg) = 2
13) Aluminium (Al) = 3
14) Silicon (Si) = 4
15) Phosphorus (P) = 3, 5
16) Sulphur (S) = 2
17) Chlorine (Cl) = 1
18) Argon (Ar) = 0
19) Potassium (K) = 1
20 ) Calcium (Ca) = 2
#Be Brainly !!
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