define i.valency
ii. Atomic size
iii. How do the valency and atomic size of the elements vary while going from left to right along a period in the modern periodic table?
Answers
Answered by
25
Heya friend!!
Rajdeep here...
(i) Valency --> Valency is the combining capacity of an element with other element. The valency of an element depends upon the number of valence electrons of that element.
(ii) Atomic size --> The atomic size of an element is defined as the size of the element, i.e., the Atomic radius. It is the distance of the outermost (valence) shell from the nucleus.
(iii) As we go from left to right in the periodic table, what happens is that, the number of shells remain the same but the number of valence electrons increase by one. Thus, the nuclear pull on the atom decreases, due to which the atomic size decreases.
So, the answer of Question number (iii) is below:
As we move from left to right across a period, the:
Atomic size of elements gradually decreases.
Valency of the element first increases from one to four, then decreases from four to zero.
Consider the 2nd period......
Valency of elements (Li, Be, B, C, N, O, F, He) are 1, 2, 3, 4, 3, 2, 1, 0 respectively.
Size: Li>Be>B>C>N>O>F (Note that size of noble gases are more...this is an exceptional case as noble gases have a complete outer shell configuration).
Hence, Lithium is the largest and Fluorine is the smallest.
Hope my answer is satisfactory...
Thanks!!
Rajdeep here...
(i) Valency --> Valency is the combining capacity of an element with other element. The valency of an element depends upon the number of valence electrons of that element.
(ii) Atomic size --> The atomic size of an element is defined as the size of the element, i.e., the Atomic radius. It is the distance of the outermost (valence) shell from the nucleus.
(iii) As we go from left to right in the periodic table, what happens is that, the number of shells remain the same but the number of valence electrons increase by one. Thus, the nuclear pull on the atom decreases, due to which the atomic size decreases.
So, the answer of Question number (iii) is below:
As we move from left to right across a period, the:
Atomic size of elements gradually decreases.
Valency of the element first increases from one to four, then decreases from four to zero.
Consider the 2nd period......
Valency of elements (Li, Be, B, C, N, O, F, He) are 1, 2, 3, 4, 3, 2, 1, 0 respectively.
Size: Li>Be>B>C>N>O>F (Note that size of noble gases are more...this is an exceptional case as noble gases have a complete outer shell configuration).
Hence, Lithium is the largest and Fluorine is the smallest.
Hope my answer is satisfactory...
Thanks!!
Answered by
10
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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