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Question
Observe the periodic table given below and write the answers of the questions.
- Write the name and valencies of the elements in 3rd row.
- Classify the elements in this row as metal, nonmetal and metalloids.
- Which block does nonmetals belong to?
- Write name of any two metalloid elements.
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Solution
- The elements in the third period are Sodium, Magnesium, Aluminium, Silicon, Phosphorus, Sulphur, Chlorine and Argon.
Their valencies are 1, 2, 3, 4, 3, 2, 1 and 0 respectively. - Sodium (Na), Magnesium (Mg) and Aluminium (Al) are metals. Silicon (Si) is a metalloid.
Phosphorus (P), Sulphur (S) and Chlorine (Cl) are nonmetals. Argon (Ar) is an inert gas element and is not classified as a metal, nonmetal or metalloid. - Nonmetals belong to p-block.
- Two metalloid elements: Silicon and Germanium.
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i. What is the atomic number of this element?
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iii. What is the group of this element?
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Find the odd one out and give its explanation.
Find the odd one out and give its explanation.
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| Column A | Column B |
| 1) s -block | a) Lanthanides and actinides |
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| 3) d -block | c) Group 1, 2 |
| 4) f -block | d) Group 13 to 18 |
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Write an Explanation.
Group
In group 2, beryllium and calcium elements, calcium is more electropositive element than beryllium.
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- What is the atomic number of this element?
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