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प्रश्न
Explain giving reason why although the nuclear charge in atoms increases in moving from left to right in a period as well as in moving from top to bottom in a group in the Modern periodic table, but the size of the atoms does not vary similarly in both situations.
उत्तर
The distance between the centre of the nucleus and the outermost shell of an isolated atom is known as its atomic size. Radius of an atom is referred to as atomic size. As we advance along the group, the elements' atomic sizes grow. This is due to the fact that as we move along the group, additional shells are being added. This lengthens the gap between the outermost shell and the nucleus, increasing atomic size despite an increase in nuclear charge.
Additionally, as you move across a period from left to right, the atomic radius of the elements decreases. This occurs as a result of an increase in nuclear charge, which tends to draw electrons closer to the nucleus and cause an atom's size to decrease.
संबंधित प्रश्न
Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?
The following diagram shows a part of the periodic table in which the elements are arranged according to their atomic numbers. (The letters given here not the chemical symbols of the elements):
| a 3 |
b 4 |
c 5 |
d 6 |
e 7 |
f 8 |
g 9 |
h 10 |
|
| i 11 |
j 12 |
k 13 |
l 14 |
m 15 |
n 16 |
o 17 |
p 18 |
(i) Which element has a bigger atom, a or f?
(ii) Which element has a higher valency, k or o?
(iii) Which element is more metallic i or k?
(iv) Which element is more non-metallic, d or g?
(v) Select a latter which represents a metal of valency 2.
(vi) Select a letter which represents a non-metal of valency 2.
Name the type of elements which have two outermost shell incomplete.
Name an alkali metal in period 3 and halogen in period 2.
Give the symbol and valency of the following element and radical.
Potassium
Give the symbol and valency of the following element and radical.
Nitrate
Give the chemical formula of carbonic acid
On moving from left to right in a period in the periodic table, the size of the atom ______
Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Write the molecular formula of the compound formed by the combination:
E and B
