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Question
The modern periodic table shows the molecular masses of the elements in each frame.
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Solution
The modern periodic table shows the molecular masses of the elements in each frame- Wrong
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| Li | Be | B | C | N | O | F | |
| Na | Mg | Al | Si | P | S | Cl |
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(ii) What happens to the atomic size?
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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 |
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(iv) Which element is more non-metallic, d or g?
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Periodic table
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State the modern periodic law for classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
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| Period ↓ | ||||||||
| 2 | A | B | ||||||
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