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प्रश्न
Name the metals in the first twenty elements.
उत्तर
Li, Be, Na, Mg, Al, K and Ca.
संबंधित प्रश्न
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
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.
The horizontal rows in a periodic table are called _____.
An element A has 2 electrons in its fourth shell. State its electronic configuration.
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
State any five features of modern periodic table.
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
Which of the following elements would lose an electron easily?
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
Define groups of modern periodic table.
