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Question
State what is meant by the term chemical formula.
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Solution
Chemical formula is the representation of a substance by means of symbols.
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RELATED QUESTIONS
Fill in the following blank with suitable word:
The horizontal rows in a periodic table are called ...............
How were the positions of cobalt and nickel resolved in the modern periodic table?
Which element has two shells, both of which are completely filled with electrons?
What is the usual number of valence electrons and valency of group 18 elements of the periodic table?
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.
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(i) Which two elements belong to the same group?
(ii) Which two elements belong to the same period?
Give reasons for your choice.
Give the symbol and valency of the following element and radical.
Hydroxide
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
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 |
Which of the element is a Metalloid?
Match the atomic number with the following:
An element of group 2.
