1. Why are alkali metals not found in nature? 2. In what ways Lithium shares diagonal relationship with magnesium? 3. Describe the importance of the following a) Cementb)Plaster of paris c) Calcium hydroxide4. What is dead burnt plaster?5.give reason: a) Beryllium and magnesium do not give colour to the flame whereas other alkaline earth metals do. b) Alkali metals are soft and have low melting points c) Beryllium shows anomalous properties. d) Gypsum is added to the cement

Subject:
Chemistry
Author:
xavier51
Created:
1 year ago

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Answer:

1.alkali metals are never found in nature uncombined because they are unstable and they react fast to other elements easily by losing the electron. They bond well with all elements except the noble gases. When these elements are in the air, they quickly turn black.

Therefore, we can conclude that alkali metals are highly reactive chemically and do not exist in a free or native state and are not easily found in nature.

2. Diagonal relationship between Lithium and Magnesium

Lithium shows a diagonal relationship with Magnesium.

Due to its small size lithium differs from other alkali metals but resembles magnesium, as its size is closer to lithium. The diagonal relationship is formed due to the identical size of ions.

As we move downward across a group in the periodic table then the size of the atoms gradually increases.

As we move towards right across a period in the periodic table, then the size of the atom reduces.

A diagonal relationship is said to exist between certain pairs of diagonally adjacent elements in the second and third periods (first 20 elements) of the periodic table.

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ellievm7n
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